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Automatic Transaxle - 4t65-e - Introduction (2 of 2) Buick LaCrosse I

Automatic Trans 58 illustrations ~14433 words

Transmission Fluid Temperature (TFT) Sensor Specifications

TemperatureTemperatureMinimum ResistanceNominal ResistanceMaximum ResistanceSignal
°F°COhmsOhmsOhmsVolts
4040906361007071107785.00
22304741652684579524.78
4202580928677315454.34
14101455816176177943.89
32084819423103653.45
50105104567162383.01
68203164351538672.56
86302013223724611.80
104401313145916051.10
1225087697310703.25
140606006677342.88
158704204675142.56
176802993323652.24
194902172412651.70
2121001591771951.42
2301101191321451.15
24812089.999.9109.90.87
26613069.176.884.50.60
28414053.859.865.80.32
30215042.547.251.90.00

Transmission Fluid Temperature (TFT) Sensor Specifications

Fastener Tightening Specifications

Description of UsageRef. No.*QtySizeSpecification
MetricEnglish
2-1 Servo to Case1033M8x1.25x2525 N.m18 lb ft
Accumulator Cover to Case13111M6x1.0x2812 N.m106 lb in
Case Cover to Case4343M6x1.0x4012 N.m106 lb in
Case Cover to Case4363M6x1.0x3012 N.m106 lb in
Case Cover to Driven Sprocket Support4353M8x1.25x5025 N.m18 lb ft
Case Cover to Driven Sprocket Support (TORX®)4331M6x1.0x3212 N.m106 lb in
Case to Drive Sprocket Support5244M8x1.25x2325 N.m18 lb ft
Case Extension to Case54M10x1.5x3536 N.m26 lb ft
Case Side Cover to Case569M8x1.25x2525 N.m18 lb ft
Case Side Cover to Case (Stud)584M8x1.25x2525 N.m18 lb ft
Case Side Cover to Case (TORX® Special)574M8x1.25x2125 N.m18 lb ft
Detent Spring to Case Cover8051M6x1.0x1612 N.m106 lb in
Fluid Filler Tube Bracket Bolt13 N.m115 lb in
Forward Band Servo Cover to Case123M6x1.0x2012 N.m106 lb in
Manual Shaft/Detent Nut8031M10x1.532 N.m23 lb ft
Oil Cooler Fittings38 N.m28 lb ft
Oil Cooler Hose/Pipes Retaining Bracket Bolt4 N.m27 lb in
Oil Cooler Quick Connector6219/16-18 UNF32 N.m23 lb ft
Oil Cooler Quick Connector6119/16-18 UNF32 N.m23 lb ft
Oil Pan to Case2320M6x1.0x1814 N.m124 lb in
Oil Pressure Test Hole Plug3811/8-27 NPTF12 N.m106 lb in
Pump Body to Case2062M6x1.0x9516 N.m11 lb ft
Pump Cover to Case Cover2079M6x1.0x8512 N.m106 lb in
Pump Cover to Pump Body2051M6x1.0x208 N.m70 lb in
Speed Sensor to Case91M8x1.25x1212 N.m106 lb in
TFP Switch to Case3791M6x1.0x9516 N.m11 lb ft
TFP Switch to Case Cover3753M6x1.0x6012 N.m106 lb in
TFP Switch to Valve Body3812M6x1.0x208 N.m70 lb in
Torque Converter Bolts63 N.m46 lb ft
Torque Converter Cover Bolts10 N.m89 lb in
Transaxle Brace Bolts to Engine63 N.m46 lb ft
Transaxle Brace Bolts to Transaxle43 N.m32 lb ft
Transaxle Mount Bracket Bolts95 N.m70 lb ft
Transaxle Mount Lower Nuts47 N.m35 lb ft
Transaxle Mount Upper Nuts47 N.m35 lb ft
Transaxle Shift Cable Bracket Bolts30 N.m22 lb ft
Transaxle to Engine Bolt/Stud75 N.m55 lb ft
Transaxle Wiring Ground Nut25 N.m18 lb ft
Valve Body to Case3743M6x1.0x6512 N.m106 lb in
Valve Body to Case3841M6x1.0x8512 N.m106 lb in
Valve Body to Case Cover3761M6x1.0x3012 N.m106 lb in
Valve Body to Case Cover3783M6x1.0x5512 N.m106 lb in
Valve Body to Case Cover (TORX®)3772M6x1.0x4512 N.m106 lb in
Valve Body to Driven Sprocket Support3801M8x1.25x9025 N.m18 lb ft
* Reference Number refers to the callout number on the disassembled view.

Fastener Tightening Specifications

Transmission General Specifications

NameHydra-matic 4T65-E
RPO CodesM15
Production LocationWarren, MI
Vehicle Platform (Engine/Transmission) UsageW
Transaxle DriveTransverse Mounted Front Wheel Drive
1st Gear Ratio2.921:1
2nd Gear Ratio1.568:1
3rd Gear Ratio1.000:1
4th Gear Ratio0.705:1
Reverse2.385:1
Torque Converter Size (Diameter of Torque Converter Turbine)245 mm 258 mm
Pressure TapsLine Pressure
Transaxle Fluid TypeDEXRON® VI
Transaxle Fluid Capacity (Approximate)Bottom Pan Removal: 7.0 L (7.4 qts) Complete Overhaul: 9.5 L (10.0 qts) Dry: 12.7 L (13.4 qts)
Transaxle Type: 4Four Forward Gears
Transaxle Type: TTransverse Mount
Transaxle Type: 65Product Series
Transaxle Type: EElectronic Controls
Chain Ratios (Designates Number of Teeth on the Drive/Driven Sprockets)35/35, 37/33
Final Drive Ratios2.86, 3.29
Overall Final Drive Ratios2.86, 3.69
Position QuadrantP, R, N, D, 3, 2, 1
Case MaterialDie Cast Aluminum
Transaxle Weight Dry87.9 kg (194.2 lbs)
Transaxle Weight Wet97.0 kg (214.4 lbs)
Maximum Trailer Towing Capacity907 kg (2,000 lbs)
Maximum Gross Vehicle Weight (GVW)2903 kg (6,400 lbs)

Transmission General Specifications

Fluid Capacity Specifications

ApplicationSpecification
MetricEnglish
Bottom Pan Removal7.0 liters7.4 quarts
Complete Overhaul9.5 liters10.0 quarts
Dry12.7 liters13.4 quarts

Fluid Capacity Specifications

Range Reference

ParkReverseNeutralD321
Gear1st2nd3rd4th1st2nd3rd1st2nd1st
1-2 Shift SolenoidONONONONOFFOFFONONOFFOFFONOFFON
2-3 Shift SolenoidONONONONONOFFOFFONONOFFONONON
Fourth ClutchA
Reverse BandA
Second ClutchAAAAAA
Third ClutchAA*AA
Third SpragHOHH
Input ClutchA*AA*AA*AA*AAA*A
Input SpragH*HHHOHOHHOH
2-1 Manual BandAAA
1-2 Support Roller ClutchHHOOHHOHHH
Forward BandAAA*A*AAA*AAA
ON = the solenoid valve is energized. OFF = the solenoid valve is de-energized. A = Applied H = Holding O = Overrun * = applied or holding, with no load-not transmitting torque.

Range Reference

Shift Solenoid Valve State and Gear Ratio

Gear Range1-2 Shift Solenoid Valve2-3 Shift Solenoid ValveRatio
FirstONON2.87:1 to 2.97:1
SecondOFFON1.52:1 to 1.62:1
ThirdOFFOFF0.95:1 to 1.05:1
FourthONOFF0.65:1 to 0.75:1
ReverseONON2.33:1 to 2.43:1

Shift Solenoid Valve State and Gear Ratio

Shift Speed

1-2 Shift @ +/- 3 mph Output Shaft Speed2-3 Shift @ +/- 4 mph Output Shaft Speed3-4 Shift @ +/- 5 mph Output Shaft Speed4-3 @ +/- 4 mph Output Shaft Speed3-2 @ +/- 4 mph Output Shaft Speed2-1 @ +/- 4 mph Output Shaft Speed3rd Gear TCC Apply4th Gear TCC Apply
% of TPS12255012255012255005005005012251225
BodyAxle
M15 Models
6KEBFR31724362639564665N/A40621936121030504565
6CDBFQ31518312533564153N/A33501834131132404052

Shift Speed

Transmission Internal Mode Switch Logic

Gear Selector PositionABCP
ParkLOWHIHILOW
Park/ReverseLOWLOWHILOW
ReverseLOWLOWHIHI
Reverse/NeutralHILOWHIHI
NeutralHILOWHILOW
Neutral/Drive 4HILOWLOWLOW
Drive 4HILOWLOWHI
Drive 4/Drive 3LOWLOWLOWHI
Drive 3LOWLOWLOWLOW
Drive 3/Drive 2LOWHILOWLOW
Drive 2LOWHILOWHI
Drive 2/Drive 1HIHILOWHI
Drive 1HIHILOWLOW
InvalidHIHIHIHI
LOWHIHIHI
HIHIHILOW
HI = Ignition voltage LOW = 0 voltage

Transmission Internal Mode Switch Logic

Line Pressure

Pressure Control Solenoid Valve CurrentApproximate Line Pressure*
MetricEnglish
0 amp1682-1993 kPa244-289 psi
0.1 amp1661-1986 kPa241-288 psi
0.2 amp1606-1937 kPa233-281 psi
0.3 amp1524-1889 kPa221-274 psi
0.4 amp1400-1800 kPa203-261 psi
0.5 amp1255-1682 kPa182-244 psi
0.6 amp1048-1544 kPa152-224 psi
0.7 amp814-1358 kPa118-197 psi
0.8 amp565-1138 kPa82-165 psi
0.9 amp462-917 kPa67-133 psi
0.95 amp462-793 kPa67-115 psi
1 amp462-676 kPa67-98 psi
1.05 amp462-572 kPa67-83 psi
1.1 amp462-538 kPa67-78 psi
*Approximate Line Pressure is measured at an engine speed of 1,400 RPM.

Line Pressure Specifications

Component Resistance

ComponentPass Thru PinsResistance at 20°C (68°F)Resistance at 88°C (190°F)Resistance to Ground (Case)
1-2 Shift Solenoid ValveA, E19-24 ohms24-31 ohmsGreater than 250 K ohms
2-3 Shift Solenoid ValveB, E19-24 ohms24-31 ohmsGreater than 250 K ohms
Torque Converter Clutch Pulse Width Modulation Solenoid ValveT, E10-12 ohms13-15 ohmsGreater than 250 K ohms
Pressure Control Solenoid ValveC, D3-5 ohms5-6 ohmsGreater than 250 K ohms
Automatic Transmission Input Speed SensorS, V820-1020 ohms1132-1428 ohmsGreater than 250 K ohms
Automatic Transmission Fluid Temperature Sensor* M, L3164-3867 ohms225-285 ohmsGreater than 10 M ohms
Vehicle Speed SensorA, B VSS CONN1650-2200 ohms2360-3180 ohms @ 150°C (302°F)Greater than 10 M ohms
* The resistance of this device changes rapidly with temperature. For other temperatures, refer to Transmission Fluid Temperature (TFT) Sensor Specifications .

Component Resistance

Automatic Transmission Schematic Icons

Automatic Transmission Schematic Icons Icon Icon Definition NOTE: The OBD II symbol is used on the circuit diagrams in order to alert the technician that the circuit is essential for proper OBD II emission control circuit operation. Any circuit which fails and causes the malfunction indicator lamp (MIL) to turn ON or causes emissions-related component damage, is identified as an OBD II circuit. IMPORTANT: Twisted-pair wires provide an effective "shield" that helps protect sensitive electronic components from electrical interference. If the wires were covered with shielding, install new shielding. In order to prevent electrical interference from degrading the performance of the connected components, you must maintain the proper specification when making any repairs to the twisted-pair wires shown : The wires must be twisted a minimum of 9 turns per 31 cm (12 in) as measured anywhere along the length of the wires The outside diameter of the twisted wires must not exceed 6.0 mm

Scheme 14

Scheme 14: Automatic Transmission Schematic Icons
Scheme 14: Automatic Transmission Schematic Icons

Scheme 15

Scheme 15
Scheme 15

Scheme 16

Scheme 16: Automatic Transmission Controls Schematics
Scheme 16: Automatic Transmission Controls Schematics

Scheme 17

Scheme 17
Scheme 17

Scheme 18

Scheme 18
Scheme 18

Scheme 19

Scheme 19
Scheme 19

Scheme 20

Scheme 20
Scheme 20

Scheme 21

Scheme 21
Scheme 21

Scheme 22

Scheme 22
Scheme 22

Scheme 23

Scheme 23: Automatic Transmission Electronic Component Views
Scheme 23: Automatic Transmission Electronic Component Views
CalloutComponent Name
10Vehicle Speed Sensor (VSS) Assembly
315a1-2, 3-4 Shift Solenoid (SS) Valve Assembly
315b2-3 Shift Solenoid (SS) Valve Assembly
322Pressure Control (PC) Solenoid Valve Assembly
334Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Assembly
391Transmission Fluid Temperature (TFT) Sensor
395Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly
440Automatic Transmission Input Shaft Speed (A/T ISS) Sensor Assembly
811Lever Assembly-Manual Shaft Detent with Shift Position Switch - Internal Mode Switch (IMS)

Scheme 24

Scheme 24: Disassembled Views
Scheme 24: Disassembled Views
CalloutComponent Name
3Transmission Case Assembly
53Control Valve Body Cover
54Control Valve Body Cover Gasket
56Control Valve Body Cover Bolt M 8 X 1.25 X 25
57Control Valve Body Cover TORX® Head Bolt M 8 X 1.25 X 21
58Control Valve Body Cover to Case Stud M 8 X 1.25 X 24
59Control Valve Body Cover to Case Cover Seal
200Oil Pump Assembly - Model Dependent
200Oil Pump Assembly - Model Dependent
225Wiring Harness Assembly (IMS)
226Wiring Harness Clip
230Pump Cover to Case Cover Bolt M 6 X 1.0 X 95.0
231Pump Body to Case Bolt M6 X 1.0 X 87.5
300Control Valve Body Assembly - Model Dependent
300Control Valve Body Assembly - Model Dependent
368Spacer Plate and Gaskets/Control Valve Body Bolt
368Spacer Plate and Gaskets/Control Valve Body Bolt
3721/4 Ball Check Valve
3725/16 Ball Check Valve
373Ball Check Valve
373Ball Check Valve
374Control Valve Body Bolt M 6 X 1.0 X 65.0
375Control Valve Body to Case Bolt M 6 X 1.0 X 60.0
375Control Valve Body to Case Bolt M 6 X 1.0 X 60.0
376Control Valve Body to Case Bolt M 6 X 1.0 X 30.0
377Control Valve Body to Case Cover Bolt M 6 X 1.0 X 45.0
378Control Valve Body to Case Cover Bolt M 6 X 1.0 X 55.0
380Control Valve Body to Case Bolt M 8 X 1.25 X 90.0
381Control Valve Body to Case Bolt M 6 X 1 X 20.0
382TCC Solenoid Valve Screen/Seal Assembly
382TCC Solenoid Valve Screen/Seal Assembly
384Control Valve Body to Case Bolt M 6 X 1.0 X 85.0
390Temperature Sensor Clip
391Transmission Fluid Temperature Sensor
391Transmission Fluid Temperature Sensor
395Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly
396Control Valve Body Spacer Plate and Gasket Assembly

Scheme 25

Scheme 25
Scheme 25
CalloutComponent Name
1Torque Converter Assembly
2Torque Converter Bushing
3Transmission Case
4Right Axle Oil Seal Assembly
5Case Extension Bolt M 10 X 1.5 X 35.0
6Case Extension Assembly
7aFront Differential Carrier Bushing
7bOutput Shaft Bearing Assembly
8Case Extension Seal
9Vehicle Speed Sensor Bolt M 8 X 1.25 X 12.0
10Vehicle Speed Sensor Assembly
11Vehicle Speed Sensor O-Ring Seal
12FWD Servo Cover Bolt M 6 X 1.0 X 20.0
13Forward Band Servo Cover
14Forward Band Servo Cover Seal
15Forward Band Servo Pin Retaining Ring
16Forward Band Servo Piston
18Forward Band Servo Piston Oil Seal Ring
19Forward Band Servo Piston Cushion Outer Spring
20Forward Servo Cushion Spring Retainer
21Forward Band Servo Piston Apply Pin
22Forward Band Servo Piston Return Spring
23Transmission Oil Pan Bolt M 6 X 1.0 X 17.0
24Transmission Oil Pan
25Transmission Oil Pan Gasket
26Transmission Oil Pan Magnet
27Oil Dam
37Transmission Vent Assembly
38Oil Pressure Test Hole Plug 1/8 - 27 NPTF
39Reverse Band Servo Cover Retaining Ring
40Reverse Band Servo Cover
41Reverse Band Servo Cover O-Ring Seal
42Reverse Band Servo Pin Retaining Ring
43Reverse Band Servo Piston Oil Seal Ring
44Reverse Band Servo Piston
45Reverse Band Servo Piston Cushion Spring
46Reverse Band Servo Piston Cushion Spring Retainer
47Reverse Band Servo Piston Cushion Spring Inner
48Reverse Band Servo Piston Apply Pin
49Reverse Band Servo Piston Return Spring
60Clip, Oil Cooler Quick Connect
60Clip, Oil Cooler Quick Connect
61Transmission Oil Cooler Pipe Fitting 9/16-18 UNF
62Transmission Oil Cooler Pipe Fitting 9/16-18 UNF
65Forward Band Servo Piston Cushion Inner Spring
100Transmission Oil Filter Assembly
101Transmission Oil Filter Seal Assembly
227Oil Pump Drive Shaft Assembly
228Oil Pump Drive Shaft Seal
372Case Cover Ball Check Valve
372Case Cover Ball Check Valve
400Complete Case Cover Assembly

Scheme 26

Scheme 26
Scheme 26
CalloutComponent Name
3Transmission Case
400Complete Case Cover Assembly
4324th Clutch Shaft Thrust Washer
433Case Cover Bolt/Screw TORX® Special M6 X 1.0 X 32.0
434Case Cover Bolt/Screw M6 X 1.0 X 40.0
435Case Cover Bolt/Screw M8 X 1.25 X 50.0
436Case Cover Bolt/Screw M6 X 1.0 X 30.0
5014th Clutch Fiber Plate Assembly
5014th Clutch Fiber Plate Assembly
5024th Clutch Steel Plate
5024th Clutch Steel Plate
5044th Clutch Shaft Assembly
5054th Clutch Shaft Thrust Washer
506Driven Sprocket
507Drive Link Assembly
508Driven Sprocket Thrust Washer
509Drive Shaft Retaining Ring
510aStandard Output Shaft
510bHeavy Duty Output Shaft
513Turbine Shaft Oil Seal Ring
514Drive Sprocket Thrust Washer
515Drive Sprocket Retaining Ring
516Drive Sprocket
517Drive Sprocket Thrust Washer
518Turbine Shaft
519Turbine Shaft Oil Seal Ring
520Turbine Shaft O-Ring Seal
521Drive Sprocket Support Bearing Assembly
522Drive Sprocket Support
523Drive Sprocket Support Bushing
524Drive Sprocket Support Bolt/Screw M8 X 1.25 X 24.0
525Torque Converter Oil Seal Assembly
526Case Cover Pin
526Case Cover Pin
527Speed Sensor Reluctor Wheel Assembly
5284th Clutch Apply Plate

Scheme 27

Scheme 27
Scheme 27
CalloutComponent Name
3Transmission Case
400Complete Case Cover Assembly
4324th Clutch Shaft Thrust Washer
433Case Cover Bolt/Screw TORX® Special M6 X 1.0 X 32.0
434Case Cover Bolt/Screw M6 X 1.0 X 40.0
435Case Cover Bolt/Screw M8 X 1.25 X 50.0
436Case Cover Bolt/Screw M6 X 1.0 X 30.0
5024th Clutch Steel Plate
5044th Clutch Shaft Assembly
5054th Clutch Shaft Thrust Washer
506Driven Sprocket
507Drive Link Assembly
508Driven Sprocket Thrust Washer
509Drive Shaft Retaining Ring
510aStandard Output Shaft
510bHeavy Duty Output Shaft
513Turbine Shaft Oil Seal Ring
514Drive Sprocket Thrust Washer
515Drive Sprocket Retaining Ring
516Drive Sprocket
517Drive Sprocket Thrust Washer
518Turbine Shaft
519Turbine Shaft Oil Seal Ring
520Turbine Shaft O-Ring Seal
521Drive Sprocket Support Bearing Assembly
522Drive Sprocket Support
523Drive Sprocket Support Bushing
524Drive Sprocket Support Bolt/Screw M8 X 1.25 X 24.0
525Torque Converter Oil Seal Assembly
526Case Cover Pin
526Case Cover Pin
527Speed Sensor Reluctor Wheel Assembly
5284th Clutch Apply Plate
5294th Clutch Fiber Plate Assembly
5294th Clutch Fiber Plate Assembly
5304th Clutch Steel Plate
5304th Clutch Steel Plate

Scheme 28

Scheme 28
Scheme 28
CalloutComponent Name
3Transmission Case Assembly
1032-1 Manual Band Servo Cover Bolt/Screw M8 X 1.25 X 25.0 (3)
1042-1 Manual Band Servo Cover
1052-1 Manual Band Servo Cover Seal
1062-1 Manual Band Servo Piston Pin Retaining Ring
1072-1 Manual Band Servo Piston Seal
1082-1 Manual Band Servo Piston
1092-1 Manual Band Servo Piston Cushion Spring
1102-1 Manual Band Servo Piston Spring Retainer
1112-1 Manual Band Servo Piston Pin
1122-1 Manual Band Servo Piston Spring
1132-1 Manual Band Servo Piston Cylinder O-Ring Seal
1142-1 Manual Band Servo Piston Cylinder
1152-1 Manual Band Servo Exhaust Screen Assembly
117aForward Band Anchor Pin
117bReverse Band Anchor Pin
120Thermo Element Plate Pin
121Thermo Element
122Thermo Element Plate
123Thermo Element Plate Center Pin
124Forward Band Servo Oil Pipe
1252-1 Manual Band Servo Oil Pipe
126Lube Oil Pipe
127Lube Oil Hose Clamp
127Lube Oil Hose Clamp
128Lube Oil Hose
129Lube Oil Pipe Retainer
130Lube Oil Pipe and Washer Assembly
131Accumulator Cover Bolt/Screw M6 X 1.0 X 28.0 (11)
132Accumulator Cover
134Accumulator Cover Spacer Plate Assembly
135a1-2 Accumulator Piston Pin
135b2-3 Accumulator Piston Pin
136a1-2 Accumulator Piston
136b2-3 Accumulator Piston
137a1-2 Accumulator Piston Oil Seal Ring
137b2-3 Accumulator Piston Oil Seal Ring
1382-3 Accumulator Piston Outer Spring
1391-2 Accumulator Piston Cushion Spring
1401-2 and 2-3 Accumulator Housing
1421-2 Accumulator Piston Outer Spring
1432-3 Accumulator Piston Cushion Spring

Scheme 29

Scheme 29
Scheme 29
CalloutComponent Name
201Pump Cover
209Oil Pump Vane Ring
209Oil Pump Vane Ring
210Oil Pump Selective Rotor
211Oil Pump Selective Vane
212Oil Pump Slide Oil Seal Ring
213Oil Pump Slide O-Ring Seal
214Oil Pump Selective Slide
215Oil Pump Slide Pivot Pin
220Oil Pump Slide Seal
221Oil Pump Slide Seal Support
227Oil Pump Body
228Oil Pump Body Alignment Pin
229Oil Pump Base
230Oil Pump Prime Spring

Scheme 30

Scheme 30
Scheme 30
CalloutComponent Name
301Control Valve Body Machined
302Line Boost Valve and Bushing Retainer
303Line Boost Valve Bore Plug
304Line Boost Valve
305TCC PWM Solenoid Valve O-Ring Seal
306TCC PWM Solenoid Valve O-Ring Seal
307Pressure Control Solenoid Valve O-Ring Seal
309Reverse Boost Valve Bushing
310Reverse Boost Valve
311Pressure Regulator Valve Spring Outer
312Pressure Regulator Valve Inner Spring
313Pressure Regulator Valve
314d1-2, 3-4 Shift Solenoid Valve Retainer
314ePressure Control Solenoid Valve Retainer
314fTCC PWM Solenoid Valve Retainer
314gTCC Regulator Apply Valve Bore Plug Retainer
3151-2, 3-4 Shift Solenoid Valve Assembly
316a1-2, 3-4 Shift Solenoid Valve O-Ring Seal
316bPressure Control Solenoid Valve O-Ring Seal
3171-2 Shift Valve Spring
3181-2 Shift Valve
320Torque Signal Regulator Valve Spring
321Torque Signal Regulator Valve
322Pressure Control Solenoid Valve Assembly
323Line Pressure Relief Valve Spring
324Line Pressure Relief Valve
325Line Pressure Relief Valve Spring Retainer
326TCC Regulator Apply Valve Spring
327TCC Regulator Apply Valve - Some Models have touch activated Power
327TCC Regulator Apply Valve - Some Models have touch activated Power
328TCC Regulator Apply Valve Bore Plug O-Ring Seal
329TCC Regulator Apply Valve Bore Plug
334TCC PWM Solenoid Valve Assembly
335TCC Control Valve
336TCC Control Valve Spring

Scheme 31

Scheme 31
Scheme 31
CalloutComponent Name
301Machined Control Valve Body
314a1-2 Accumulator Valve Retainer
314b4-3 Manual Downshift Valve Retainer
314c2-3 Shift Solenoid Valve Retainer
315b2-3 Shift Solenoid Valve Assembly
316O-Ring Seal
3391-2 Accumulator Valve Bore Plug
3403-4 Accumulator Valve Spring
3413-4 Accumulator Valve - Some Models have touch activated Power
3413-4 Accumulator Valve - Some Models have touch activated Power
3422-3 Accumulator Valve Bore Plug Retainer
3432-3 Accumulator Valve Bore Plug
3442-3 Accumulator Valve
3452-3 Accumulator Valve Bushing
3462-3 Accumulator Valve Spring
3501-2 Accumulator Valve
3511-2 Accumulator Valve Spring
3533-2 Manual Downshift Valve Retainer
3543-2 Manual Downshift Valve Bore Plug
3553-2 Manual Downshift Valve Spring
3563-2 Manual Downshift Valve
3572-3 Shift Valve
3594-3 Manual Downshift Valve Bore Plug
3604-3 Manual Downshift Valve
3614-3 Manual Downshift Valve Spring
3623-4 Shift Valve
3852-3 Accumulator Valve Bushing Assembly Retainer

Scheme 32

Scheme 32
Scheme 32
CalloutComponent Name
401Case Cover
402Manual Valve Link
403Manual Valve Link Spring
404Manual Valve
405Low Blow Off Ball Valve Bore Plug
406Low Blow Off Ball Valve Spring
407Cooler Ball Valve Spring
409Left Side Axle Oil Seal Assembly
410Control Valve Body Alignment Sleeve
411Bore Plug
411Bore Plug
412Orificed Cup Plug
414Actuator Feed Limit Valve
415Actuator Feed Limit Valve Spring
416Actuator Feed Limit Valve Spring Retainer
417Ball Valve Bore Plug
418TCC Blow Off Ball Valve Spring
420aLow Blow Off Ball Valve
420bTCC Blow Off Ball Valve
420cCooler Ball Valve
4213-4 Accumulator Piston Cylinder
4223-4 Accumulator Piston Cylinder O-Ring Seal
4233-4 Accumulator Piston Outer Spring
4243-4 Accumulator Piston Inner Spring
4263-4 Accumulator Piston Pin
4273-4 Accumulator Piston Oil Seal Ring
4283-4 Accumulator Piston
429Case Cover Lower Gasket
430Case Cover Upper Gasket
431Front Wheel Drive Shaft Bearing Assembly
432Fourth Clutch Shaft Thrust Washer
440Input Speed Sensor Assembly
441Input Speed Sensor Clip
442Low Regulator Valve Spring 3-4 Accumulator Valve - Some Models have touch activated Power
443Low Regulator Valve 3-4 Accumulator Valve - Some Models have touch activated Power
444Low Regulator Valve Bore Plug 3-4 Accumulator Valve - Some Models have touch activated Power
514Drive Sprocket/Case Cover Thrust Washer
526Case Cover Dowel Pin
526Case Cover Dowel Pin

Scheme 33

Scheme 33
Scheme 33
CalloutComponent Name
6014th Clutch Spring Retaining Ring
6024th Clutch Piston Return Spring Assembly
6034th Clutch Piston Assembly
6044th Clutch Piston Seal Outer
6054th Clutch Piston Seal Inner
606Drawn Cup Bearing Assembly
607Orificed Cup Plug
608Drive Link Lube Scoop
609Driven Sprocket Support Assembly
610Cup Plug
611Thrust Washer Driven Sprocket Support 2nd Clutch Drum
613Oil Seal Ring
614Driven Sprocket Support Bushing
615Reverse Band Assembly
61675.5 OD X 8.0 Bushing
6172nd Clutch Housing
618Check Valve Retainer and Ball Assembly 2nd Clutch
61970.0 OD X 11.0 Bushing
6202nd Clutch Piston w/Molded Seal
6212nd Clutch Apply Ring and Release Spring Assembly
622Retaining Ring
6232nd Clutch Plate Waved
6242nd Clutch Plate Assembly Fiber
6252nd Clutch Reaction Plate Steel
626Backing Support Ring Plate Steel
6272nd Clutch Retaining Ring Outer
628Oil Seal Ring Input Shaft
629Thrust Bearing Support Sprocket/Thrust Washer
630Selective Thrust Washer Bearing/Input Clutch Hub
631Input Shaft Bushing
632Input Housing Sleeve and Shaft Assembly
633Check Valve Retainer and Ball Assembly
634Input Clutch Piston Seal Inner
635Input Clutch Piston Seal Outer
636Input Clutch Piston
637Input Clutch Spring and Retainer Assembly
638O-Ring Seal
6393rd Clutch Piston Housing
640Retaining Ring 3rd Clutch Piston Housing/Input Shaft
640Retaining Ring 3rd Clutch Piston Housing/Input Shaft
6413rd Clutch Piston Seal Inner
6423rd Clutch Piston and Seal Assembly
6433rd Clutch Spring Retainer and Guide Assembly
644Thrust Bearing Assembly
6453rd Clutch Plate Waved
6463rd Clutch Plate Assembly OD Spline
6473rd Clutch Plate Assembly ID Spline
6483rd Clutch Backing Plate
6493rd Clutch Backing Plate Retaining Ring
654Input Clutch Apply Plate
655Input Clutch Plate Waved
656Input Clutch Plate Assembly Fiber - Sprag Model
657Input Clutch Plate Steel
657Input Clutch Plate Steel
658Input Clutch Backing Plate Steel
659Input Clutch Backing Plate Retaining Ring
7162nd Clutch Apply Reaction Plate Tapered
7234th Clutch Shaft to Input Housing Bearing
7243rd Clutch Piston Housing Ball Check Valve Assembly
725Input Clutch Plate Assembly Fiber - Pawl Model

Scheme 34

Scheme 34
Scheme 34
CalloutComponent Name
667Input Sun Gear Spacer
668Input Sun Gear
669Reverse Reaction Drum
671Input Sun Gear Thrust Bearing Assembly
672Input Complete Carrier Assembly
673Input Carrier/Reaction Carrier Lube Dam
674Input/Reaction Carrier Thrust Bearing Assembly
675Reaction Complete Carrier Assembly
676Reaction Carrier/Sun Gear Thrust Bearing Assembly
677Left Hand Reaction Sun Gear Bushing
678Reaction Sun/Drum Gear Assembly
679Right Hand Reaction Sun Gear Bushing
6802/1 Manual Band Assembly
6831/2 Support Roller Clutch Assembly
685Thrust Bearing Assembly
6861/2 Support Bushing
6871/2 Support and Drum
688Forward Band Assembly
689Final Drive Sun Gear Shaft
690Final Drive Internal Gear Bushing
690Final Drive Internal Gear Bushing
691Bearing 1/2 Support/Internal Gear
692Retaining Ring Final Drive Internal Gear
693Final Drive Internal Gear
694Park Pawl Assembly
695Thrust Bearing Assembly Internal Gear/Parking Gear
696Parking Gear
697Final Drive Sun Gear
698Carrier/Sun Gear Thrust Bearing Assembly
699Spiral Pinion Gear Pin Retaining Ring
700Differential/Final Drive Carrier Assembly
701Differential Pinion Shaft
702Differential Pinion Shaft Retaining Pin
703Thrust Washer Differential Pinion
703Thrust Washer Differential Pinion
704Differential Pinon Gear
704Differential Pinon Gear
705Differential Side Gear MN7 has unique left/right gears
705Differential Side Gear MN7 has unique left/right gears
706Bronze Thrust Washer Differential Side Gear
706Bronze Thrust Washer Differential Side Gear
708Pinion Thrust Washer Steel
708Pinion Thrust Washer Steel
709Roller Needle Bearing
710Pinion Needle Bearing Spacer
711Final Drive Planetary Pinion Gear
712Planetary Pinion Gear Pin
713Vehicle Speed Sensor Reluctor Wheel
714Differential Carrier/Case Washer Thrust
715Thrust Bearing Assembly
7273rd Clutch Pawl Assembly
728Input Clutch Pawl Assembly

Scheme 35

Scheme 35
Scheme 35
CalloutComponent Name
800Park Pawl Actuator Assembly
801Manual Shift Shaft Pin
804Manual Shift Detent Assembly
805Manual Shift Detent Bolt/Screw
806Manual Shift Shaft Seal Assembly
808Park Pawl Actuator Guide Pin
809Park Pawl Actuator Guide
810Park Pawl Actuator Guide O-Ring Seal
811Lever Assembly-Manual Shaft Detent with Internal Mode Switch (IMS)

Scheme 36

Scheme 36
Scheme 36
CalloutComponent Name
3Transmission Case
8Case Extension Seal
9Vehicle Speed Sensor Bolt M8 X 1.25 X 12.0
10Vehicle Speed Sensor Assembly
11Vehicle Speed Sensor O-Ring Seal
509Output Shaft Snap Ring
509Output Shaft Snap Ring
510Output Shaft
689Final Drive Sun Gear Shaft
695Parking Gear Thrust Bearing
696Parking Gear
697Final Drive Sun Gear
901Oil Dam
902Selective Washer
903Brace Bolts
903Brace Bolts
904Transfer Case Lower Brace Bolt
905Side Brace
906Lower Brace
907Transfer Case to Case Bolts
908Transfer Case Assembly
909Transfer Case to Case Bolts
910Transfer Case to Case Bolts
911Output Stub Shaft
912Output Stub Shaft Snap Ring

Scheme 37

Scheme 37: Component Location
Scheme 37: Component Location
CalloutComponent Name
1Oil Pump Assembly
2Case Cover Assembly
3Control Valve Body Assembly
4Drive Sprocket
5Torque Converter Assembly
6Reverse Band Assembly
7Third Clutch Sprag Assembly
8Input Clutch Sprag Assembly
9Input Carrier Assembly
102-1 Manual Band Assembly
11Reaction Carrier Assembly
121/2 Support Roller Clutch Assembly
13Vehicle Speed Sensor Assembly
14Final Drive/Differential Carrier Assembly
15Forward Band Assembly
162-1 Manual Band Servo Assembly
17Input Clutch Assembly
18Third Clutch Assembly
19Second Clutch Assembly
20Oil Filter Assembly
21Driven Sprocket Support Assembly
22Driven Sprocket
23Drive Link Assembly
24Fourth Clutch Assembly
25Output Shaft

Scheme 38

Scheme 38
Scheme 38
CalloutComponent Name
56Side Cover Bolt/Screw M8 X 1.25 X 25.0 (9)
57Side Cover Bolt/Screw M8 X 1.25 X 21.0 (4)
58Side Cover Bolt/Screw M8 X 1.25 X 24.0 (4)

Scheme 39

Scheme 39
Scheme 39
CalloutComponent Name
230Pump Body to Case Bolt M6 X 1.0 X 95.0 (2)
230Pump Body to Case Bolt M6 X 1.0 X 95.0 (2)
231Pump Cover to Case Cover Bolt M6 X 1.0 X 87.5 (9)
231Pump Cover to Case Cover Bolt M6 X 1.0 X 87.5 (9)
231Pump Cover to Case Cover Bolt M6 X 1.0 X 87.5 (9)
231Pump Cover to Case Cover Bolt M6 X 1.0 X 87.5 (9)

Scheme 40

Scheme 40
Scheme 40
CalloutComponent Name
374Control Valve Body Bolt/Screw M6 X 1.0 X 65.0 (3)
375Control Valve Body Bolt/Screw M6 X 1.0 X 60.0 (2)
376Control Valve Body Bolt/Screw M6 X 1.0 X 30.0 (1)
377Control Valve Body Bolt/Screw M6 X 1.0 X 45.0 (2)
378Control Valve Body Bolt/Screw M6 X 1.0 X 55.0 (3)
379Control Valve Body Bolt/Screw M6 X 1.0 X 87.5 (1)
380Control Valve Body Bolt/Screw M8 X 1.0 X 90.0 (1)
381Control Valve Body Bolt/Screw M6 X 1.0 X 20.0 (1)
384Control Valve Body Bolt/Screw M6 X 1.0 X 85.0 (1)

Scheme 41

Scheme 41
Scheme 41
CalloutComponent Name
433Case Cover Bolt/Screw TORX® Plus Special M6 X 1.0 X 32.0 (1)
434Case Cover Bolt/Screw M6 X 1.0 X 40.0 (3)
435Case Cover Bolt/Screw M8 X 1.25 X 50.0 (3)
436Case Cover Bolt/Screw M6 X 1.0 X 30.0 (3)
805Case Cover Bolt/Screw M6 X 1.0 X 16.0 (1)

Scheme 42

Scheme 42
Scheme 42
CalloutComponent Name
23Transmission Oil Pan Bolt M6 X 1.0 X 17.0 (20)
1032-1 Manual Band Servo Cover Bolt/Screw M8 X 1.25 X 25.0 (3)
131Accumulator Cover Bolt/Screw M6 X 1.0 X 28.0 (11)

Scheme 43

Scheme 43
Scheme 43
CalloutComponent Name
432Fourth Clutch Shaft Thrust Washer
505Fourth Clutch Shaft Thrust Washer
508Driven Sprocket Thrust Washer
514Drive Sprocket Thrust Washer
517Drive Sprocket Thrust Washer
611Second Clutch Housing Thrust Washer
630Input Clutch Housing Thrust Washer Selective
703Differential Pinion Thrust Washer
706Differential Side Gear Thrust Washer Bronze
708Planetary Pinion Gear Thrust Washer Steel
714Differential Carrier/Case Thrust Washer

Scheme 44

Scheme 44
Scheme 44
CalloutComponent Name
2Torque Converter Bushing
7aFront Differential Carrier Bushing M15 and MN3 Models Only
523Turbine Shaft Bushing
614Second Clutch Housing Bushing
616Second Clutch Housing Front Bushing
619Second Clutch Housing Rear Bushing
631Input Shaft Bushing
677Reaction Sun Gear Bushing Left Side
679Reaction Sun Gear Bushing Right Side
6861-2 Support Drum Bushing
690Front Differential Carrier Internal Gear Bushing

Scheme 45

Scheme 45
Scheme 45
CalloutComponent Name
7bOutput Shaft Bearing Assembly MN7 Models Only
208Oil Pump Drive Shaft Bearing
431Front Wheel Drive Shaft Bearing
521Drive Sprocket Bearing Assembly
606Driven Sprocket Bearing Assembly
629Input Clutch Housing Thrust Bearing Assembly
644Input Shaft Thrust Bearing Assembly
671Input Sun Gear Thrust Bearing Assembly
674Reaction Carrier Thrust Bearing Assembly
676Reaction Sun Gear Thrust Bearing Assembly
6851-2 Drum Support Thrust Bearing
691Final Drive Gear Internal Thrust Bearing
695Front Differential Carrier Internal Gear Thrust Bearing
698Front Differential Carrier Sun Gear Thrust Bearing
709Front Differential Carrier Planetary Pinion Bearing
715Front Differential Carrier Thrust Bearing
723Input Clutch Housing Thrust Bearing

Scheme 46

Scheme 46
Scheme 46
CalloutComponent Name
4Front Wheel Drive Shaft Oil Seal Assembly Right Side
18Forward Band Servo Piston Oil Seal Ring
43Reverse Band Servo Piston Oil Seal Ring
101Automatic Transmission Oil Filter Seal
107Manual 2-1 Band Servo Piston Seal
409Front Wheel Drive Shaft Oil Seal Assembly Left Side
525Torque Converter Oil Seal Assembly
604Fourth Clutch Piston Seal Outer
605Fourth Clutch Piston Seal Inner
620Second Clutch Piston and Seal Assembly
620Second Clutch Piston and Seal Assembly
634Input Clutch Piston Seal Inner
635Input Clutch Piston Seal Outer
641Third Clutch Piston Seal Inner
642Third Clutch Piston and Seal Assembly
642Third Clutch Piston and Seal Assembly
806Manual Shift Shaft Seal

Scheme 47

Scheme 47
Scheme 47
CalloutComponent Name
8Automatic Transmission Case Extension Seal
11Vehicle Speed Sensor O-Ring Seal
14Forward Band Servo Cover Seal
41Reverse Band Servo Cover O-Ring Seal
105Manual 2-1 Band Servo Cover Seal
113Manual 2-1 Band Servo Piston Cylinder O-Ring Seal
137a1-2 Accumulator Piston Oil Seal Ring
137b2-3 Accumulator Piston Oil Seal Ring
212Automatic Transmission Oil Pump Slide Oil Seal Ring
213Automatic Transmission Oil Pump Slide O-Ring Seal
220Automatic Transmission Oil Pump Slide Seal
221Automatic Transmission Oil Pump Slide Seal Support
228Automatic Transmission Oil Pump Drive Shaft Seal
4223-4 Accumulator Piston Cylinder O-Ring Seal
4273-4 Accumulator Piston Oil Seal
513Turbine Shaft Oil Seal Ring
519Turbine Shaft Oil Seal Ring
520Turbine Shaft O-Ring Seal
612Second Clutch Housing Oil Seal Ring Four Lobe Seal
613Second Clutch Housing Oil Seal Ring
628Input Clutch Housing Oil Seal Ring
638Third Clutch Housing O-Ring Seal
810Park Pawl Actuator Guide O-Ring Seal

Scheme 48

Scheme 48
Scheme 48
CalloutComponent Name
25Oil Pan Gasket
54Case Side Cover Gasket
59Case Side Cover Inner Gasket
396Control Valve Body Spacer Plate and Gasket Assembly
429Case Cover Lower Gasket
430Case Cover Upper Gasket

Scheme 49

Scheme 49
Scheme 49
CalloutComponent Name
1TCC Apply-Release
22nd-2nd Clutch
3Input Clutch-PRN
43rd Clutch-Lo/1st
5Reverse-Reverse Servo Large
6D4-Servo Apply
7Lo-Lo/1st
8D2-Manual 2-1 Servo Feed
93rd-3rd Clutch
10Line-Lo/1st Gear

Automatic Transmission Inline 20-Way Connector End View (3.6L)

AT Inline 20-Way Connector, Engine Side Connector Part Information 15480685 20-Way F Micro-Pack 100W Series (BK) Pin Wire Color Circuit No. Function A L-GN 1222 1-2 Shift Solenoid Valve Control B YE/BK 1223 2-3 Shift Solenoid Valve Control C RD/BK 1228 PC Solenoid Valve High Control D L-BU/WH 1229 PC Solenoid Valve Low Control E PK 1339 Ignition 1 Voltage F BK/WH 771 Transmission Range Signal A G YE 772 Transmission Range Signal B H GY 773 Transmission Range Signal C J WH 776 Transmission Range Signal P K BK/WH 1451 Ground L YE/BK 1227 TFT Sensor Signal M BK 2762 Low Reference N-R - - Not Used S RD/BK 1230 ISS High Signal T BN 418 TCC PWM Solenoid Valve Control U WH 1804 TCC Release Switch Signal V D-BU/WH 1231 ISS Low Signal W OG/BK 1786 Park/Neutral Signal

Scheme 50

Scheme 50: Automatic Transmission Inline 20-Way Connector End View (3.6L)
Scheme 50: Automatic Transmission Inline 20-Way Connector End View (3.6L)

AT Inline 20-Way Connector, Transmission Side Connector Part Information 15409446 20-Way M Micro-Pack 100W (BK) Pin Wire Color Circuit No. Function A L-GN 1222 1-2 Shift Solenoid Valve Control B YE 1223 2-3 Shift Solenoid Valve Control C PU 1228 PC Solenoid Valve High Control D L-BU 1229 PC Solenoid Valve Low Control E RD 839 Ignition 1 Voltage F RD/BK 771 Transmission Range Signal A G D-GN/WH 772 Transmission Range Signal B H YE/BK 773 Transmission Range Signal C J GY/WH 776 Transmission Range Signal P K BK/WH 1050 Ground L BN 1227 TFT Sensor Signal M GY 452 Low Reference N-R - - Not Used S BK 1230 ISS High Signal T TN 418 TCC PWM Solenoid Valve Control U WH 1804 TCC Release Switch Signal V D-GN 1231 ISS Low Signal W OG 1786 Park/Neutral Signal

Automatic Transmission Inline 20-Way Connector End View (3.8L)

AT Inline 20-Way Connector, Engine Side Connector Part Information 15444376 20-Way F Micro-Pack 100W Series (BK) Pin Wire Color Circuit No. Function A L-GN 1222 1-2 Shift Solenoid Valve Control B YE/BK 1223 2-3 Shift Solenoid Valve Control C RD/BK 1228 PC Solenoid Valve High Control D L-BU/WH 1229 PC Solenoid Valve Low Control E PK 1339 Ignition 1 Voltage F BK/WH 771 Transmission Range Signal A G YE 772 Transmission Range Signal B H GY 773 Transmission Range Signal C J WH 776 Transmission Range Signal P K BK/WH 451 Ground L YE/BK 1227 TFT Sensor Signal M BK 452 Low Reference S RD/BK 1230 ISS High Signal T BN 422 TCC PWM Solenoid Valve Control U WH 1804 TCC Release Switch Signal V D-BU/WH 1231 ISS Low Signal

Scheme 51

Scheme 51: Automatic Transmission Inline 20-Way Connector End View (3.8L)
Scheme 51: Automatic Transmission Inline 20-Way Connector End View (3.8L)

AT Inline 20-Way Connector, Transmission Side Connector Part Information 15409446 20-Way M Micro-Pack 100W (BK) Pin Wire Color Circuit No. Function A L-GN 1222 1-2 Shift Solenoid Valve Control B YE 1223 2-3 Shift Solenoid Valve Control C PU 1228 PC Solenoid Valve High Control D L-BU 1229 PC Solenoid Valve Low Control E RD 839 Ignition 1 Voltage F RD/BK 771 Transmission Range Signal A G D-GN/WH 772 Transmission Range Signal B H YE/BK 773 Transmission Range Signal C J GY/WH 776 Transmission Range Signal P K BK/WH 1050 Ground L BN 1227 TFT Sensor Signal M GY 452 Low Reference N-R - - Not Used S BK 1230 ISS High Signal T TN 418 TCC PWM Solenoid Valve Control U WH 1804 TCC Release Switch Signal V D-GN 1231 ISS Low Signal W OG 1786 Park/Neutral Signal

Automatic Transmission Internal Connector End Views

1-2 Shift Solenoid Valve Connector, Wiring Harness Side Connector Part Information 12162201 2-Way F Metri-Pack 150 Series (NA) Pin Wire Color Circuit No. Function A RD 839 Ignition 1 Voltage B L-GN 1222 1-2 Shift Solenoid Valve Control

2-3 Shift Solenoid Valve Connector, Wiring Harness Side Connector Part Information 12162201 2-Way F Metri-Pack 150 Series (NA) Pin Wire Color Circuit No. Function A RD 839 Ignition 1 Voltage B YE 1223 2-3 Shift Solenoid Valve Control

Automatic Transmission Fluid Pressure Manual Valve Position Switch Connector, Wiring Harness Side Connector Part Information 12146094 2-Way F Metri-Pack 150 Series (GY) Pin Wire Color Circuit No. Function A WH 1804 TCC Release Switch Signal B - - Not Used

Input Speed Sensor Connector, Wiring Harness Side Connector Part Information 12162201 2-Way F Metri-Pack 150.2 Series (NA) Pin Wire Color Circuit No. Function A D-GN 1231 ISS Low Signal B BK 1230 ISS High Signal

Pressure Control Solenoid Valve Connector, Wiring Harness Side Connector Part Information 12146094 2-Way F Metri-Pack 150 Series (GY) Pin Wire Color Circuit No. Function A PU 1228 PC Solenoid Valve High Control B L-BU 1229 PC Solenoid Valve Low Control

Torque Converter Clutch Pulse Width Modulated Solenoid Valve Connector, Wiring Harness Side Connector Part Information 12162202 2-Way F Metri-Pack 150.2 Series (BU) Pin Wire Color Circuit No. Function A RD 839 Ignition 1 Voltage B TN 418 TCC PWM Solenoid Valve Control

Transmission Fluid Temperature Sensor Connector, Wiring Harness Side Connector Part Information 12047662 2-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BN 1227 TFT Sensor Signal B GY 452 Low Reference

Transmission Internal Mode Switch Connector, Wiring Harness Side Connector Part Information 15336500 6-Way F Metri-Pack 150.2 Series (GN) Pin Wire Color Circuit No. Function A OG 1786 Park/Neutral Signal B GY/WH 776 Transmission Range Signal P C YE/BK 773 Transmission Range Signal C D D-GN/WH 772 Transmission Range Signal B E RD/BK 771 Transmission Range Signal A F BK/WH 1050 Ground

Automatic Transmission Related Connector End Views

Transmission Control Module (TCM), Engine Side - 3.6L Connector Part Information 15476993 49-Way F GT 280 Micro-64 Series, Sealed (BK) Pin Wire Color Circuit No. Function 1 BN 418 TCC PWM Solenoid Valve Control 2 L-GN 1222 1-2 Shift Solenoid Valve Control 3 RD/BK 1230 ISS High Signal 4-5 - - Not Used 6 D-GN 2362 High Speed GMLAN Serial Data Bus 7 YE 2361 High Speed GMLAN Serial Data Bus 8 - - Not Used 9 WH 1804 TCC Release Switch Signal 10 - - Not Used 11 BN 1141 Ignition 3 Voltage 12-15 - - Not Used 16 PU 401 VSS Low Signal 17 L-BU/WH 1229 PC Solenoid Valve Low Control 18-19 - - Not Used 20 YE/BK 1223 2-3 Shift Solenoid Valve Control 21-22 - - Not Used 23 GY 773 Transmission Range Signal C 24-25 - - Not Used 26 D-BU/WH 1231 ISS Low Signal 27-28 - - Not Used 29 BK/WH 771 Transmission Range Signal A 30 BK 2762 Low Reference 31 PK 1339 Ignition 1 Voltage 32 OG 1640 Battery Positive Voltage 33-34 - - Not Used 35 YE/BK 1227 TFT Sensor Signal 36 - - Not Used 37 L-BU 6106 High Speed GMLAN Serial Data Bus 38 D-BU 6105 High Speed GMLAN Serial Data Bus 39 WH 776 Transmission Range Signal P 40 RD/BK 1228 PC Solenoid Valve High Control 41 YE 400 VSS High Signal 42 WH 17 Stop Lamp Switch Signal 43-45 - - Not Used 46 YE 772 Transmission Range Signal B 47-48 - - Not Used 49 BK/WH 1451 Ground

Vehicle Speed Sensor Connector, Wiring Harness Side - 3.6L Connector Part Information 12162195 2-Way F Metri-Pack 150 2 Pull to Seat Series, Sealed (BK) Pin Wire Color Circuit No. Function A PU 401 VSS Low Signal B YE 400 VSS High Signal

Vehicle Speed Sensor Connector, Wiring Harness Side - 3.8L Connector Part Information 15336004 2-Way F GT 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A PU 401 VSS Low Signal B YE 400 VSS High Signal

DIAGNOSTIC CODE INDEX

DTCDescription
DTC P0218 (3.6L)DTC P0218 Transmission Fluid Overtemperature
DTC P0218 (3.8L)DTC P0218 Transmission Fluid Overtemperature
DTC P0502 (3.8L)DTC P0502 Vehicle Speed Sensor (VSS) Circuit Low Voltage
DTC P0503 (3.8L)DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent
DTC P0562 (3.6L)DTC P0562 System Voltage Low
DTC P0563 (3.6L)DTC P0563 System Voltage High
DTC P0601, P0602, P0603 or P0604 (3.6L)DTC P0601 Transmission Control Module (TCM) Read Only Memory (ROM) DTC P0602 Transmission Control Module (TCM) Not Programmed DTC P0603 Transmission Control Module (TCM) Long Term Memory Reset DTC P0604 Transmission Control Module (TCM) Random Access Memory (RAM)
DTC P062F (3.6L)DTC P062F Internal Control Module EEPROM Error
DTC P0711 (3.6L)DTC P0711 Transmission Fluid Temperature (TFT) Sensor Performance
DTC P0711 (3.8L)DTC P0711 Transmission Fluid Temperature (TFT) Sensor Performance
DTC P0712 (3.6L)DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage
DTC P0712 (3.8L)DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage
DTC P0713 (3.6L)DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage
DTC P0713 (3.8L)DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage
DTC P0716 (3.6L)DTC P0716 Input Speed Sensor Performance
DTC P0716 (3.8L)DTC P0716 Input Speed Sensor Performance
DTC P0717 (3.6L)DTC P0717 Input Speed Sensor Circuit Low Voltage
DTC P0717 (3.8L)DTC P0717 Input Speed Sensor Circuit Low Voltage
DTC P0722 (3.6L)DTC P0722 Output Speed Sensor Circuit Low Voltage
DTC P0723 (3.6L)DTC P0723 Output Speed Sensor Circuit Intermittent
DTC P0741 (3.6L)DTC P0741 Torque Converter Clutch (TCC) System - Stuck Off
DTC P0741 (3.8L)DTC P0741 Torque Converter Clutch (TCC) System - Stuck Off
DTC P0742 (3.6L)DTC P0742 Torque Converter Clutch (TCC) System - Stuck On
DTC P0742 (3.8L)DTC P0742 Torque Converter Clutch (TCC) System - Stuck On
DTC P0748 (3.8L)DTC P0748 Pressure Control (PC) Solenoid Control Circuit
DTC P0751 (3.6L)DTC P0751 1-2 Shift Solenoid (SS) Valve Performance - No First or Fourth Gear
DTC P0751 (3.8L)DTC P0751 1-2 Shift Solenoid (SS) Valve Performance - No First or Fourth Gear
DTC P0752 (3.6L)DTC P0752 1-2 Shift Solenoid (SS) Valve Performance - No Second or Third Gear
DTC P0752 (3.8L)Incorrect Gear Ration Sensed
DTC P0753 (3.8L)Continuous Open, Short To Ground Or Short To Voltage In The 1-2 SS Valve Circuit
DTC P0756 (3.6L)DTC P0756 2-3 Shift Solenoid (SS) Valve Performance - No First or Second Gear
DTC P0756 (3.8L)DTC P0756 2-3 Shift Solenoid (SS) Valve Performance - No First or Second Gear
DTC P0757 (3.6L)DTC P0757 2-3 Shift Solenoid (SS) Valve Performance - No Third or Fourth Gear
DTC P0757 (3.8L)DTC P0757 2-3 Shift Solenoid (SS) Valve Performance - No Third or Fourth Gear
DTC P0758 (3.8L)DTC P0758 2-3 Shift Solenoid (SS) Control Circuit
DTC P0842 (3.6L)DTC P0842 Transmission Fluid Pressure (TFP) Sensor Circuit Low Voltage
DTC P0843 (3.6L)DTC P0843 Transmission Fluid Pressure (TFP) Sensor Circuit High Voltage
DTC P0850 (3.6L)DTC P0850 Park/Neutral Position (PNP) Switch Circuit
DTC P0961 (3.6L)DTC P0961 Line Pressure Control (PC) Solenoid System Performance
DTC P0973 (3.6L)DTC P0973 1-2 Shift Solenoid (SS) Control Circuit Low Voltage
DTC P0974 (3.6L)DTC P0974 1-2 Shift Solenoid (SS) Control Circuit High Voltage
DTC P0976 (3.6L)DTC P0976 2-3 Shift Solenoid (SS) Control Circuit Low Voltage
DTC P0977 (3.6L)DTC P0977 2-3 Shift Solenoid (SS) Control Circuit High Voltage
DTC P1811 (3.6L)DTC P1811 Maximum Adapt and Long Shift
DTC P1811 (3.8L)DTC P1811 Maximum Adapt and Long Shift
DTC P1819 (3.8L)DTC P1819 Internal Mode Switch - No Start/Wrong Range
DTC P1820 (3.6L)DTC P1820 Internal Mode Switch A Circuit Low Voltage
DTC P1820 (3.8L)DTC P1820 Internal Mode Switch A Circuit Low Voltage
DTC P1822 (3.6L)DTC P1822 Internal Mode Switch B Circuit High Voltage
DTC P1822 (3.8L)DTC P1822 Internal Mode Switch B Circuit High Voltage
DTC P1823 (3.6L)DTC P1823 Internal Mode Switch P Circuit Low Voltage
DTC P1823 (3.8L)DTC P1823 Internal Mode Switch P Circuit Low Voltage
DTC P1825 (3.6L)DTC P1825 Internal Mode Switch - Invalid Range
DTC P1825 (3.8L)DTC P1825 Internal Mode Switch - Invalid Range
DTC P1826 (3.6L)DTC P1826 Internal Mode Switch C Circuit High Voltage
DTC P1826 (3.8L)DTC P1826 Internal Mode Switch C Circuit High Voltage
DTC P1887 (3.8L)DTC P1887 Torque Converter Clutch (TCC) Release Switch Circuit
DTC P1915 (3.6L)DTC P1915 Internal Mode Switch Does Not Indicate Park/Neutral (P/N) During Start
DTC P2534 (3.6L)DTC P2534 Ignition 1 Switch Circuit Low Voltage
DTC P2761 (3.8L)DTC P2761 Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit
DTC P2763 (3.6L)DTC P2763 Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit High Voltage
DTC P2764 (3.6L)DTC P2764 Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit Low Voltage

DIAGNOSTIC CODE INDEX

Scheme 52

Scheme 52: Transmission Control Module (TCM) Replacement (3.6L)
Scheme 52: Transmission Control Module (TCM) Replacement (3.6L)
CalloutComponent Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications . Preliminary Procedures Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (L26) or Battery Negative Cable Disconnect/Connect Procedure (LY7) . Remove the air cleaner housing. Refer to Air Cleaner Assembly Replacement in Engine Controls-3.6 L.
1Module, Transmission Control (TCM). Tip: Disconnect the TCM electrical connector. New TCM must be programmed. Refer to Transmission Control Module Programming and Setup in Programming and Setup

Transmission Control Module (TCM) Replacement (3.6L)

Transmission Control Module (TCM) Replacement (3.8L)

CalloutComponent Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications . Preliminary Procedures Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (L26) or Battery Negative Cable Disconnect/Connect Procedure (LY7) . Remove the air cleaner housing. Refer to Air Cleaner Assembly Replacement in Engine Controls-3.8 L. Position the powertrain control module out of the way. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls-3.8 L.
1Module, Transmission Control (TCM). Tip: Disconnect the TCM electrical connector. New TCM must be programmed. Refer to Transmission Control Module Programming and Setup in Programming and Setup

Transmission Control Module (TCM) Replacement (3.8L)

Removal Procedure

CAUTIONRefer to Automatic Transaxle Range Selector Cable Caution in Cautions and Notices.
  1. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.
  2. Remove the automatic transaxle range selector cable from the wiring harness clip or strap.
  3. Remove the automatic transaxle range selector cable retainer.
  4. Remove the automatic transaxle range selector cable from the automatic transaxle range selector lever.
  5. Remove the automatic transaxle range selector cable from the automatic transaxle range selector cable bracket by squeezing tabs on cable.
  6. If equipped with a floor console, remove the front floor console. Refer to «Console Replacement - Front Floor»(/buick/lacrosse/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
  7. Pull the carpet back to expose the automatic transaxle range selector cable. Refer to «Carpet Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  8. Remove the automatic transaxle range selector cable retainer from the console shift control.
  9. Remove the automatic transaxle range selector cable from the console shift control.
  10. Remove the automatic transaxle range selector cable from the console shift control bracket.
  11. If equipped with a steering column shift control, remove the left knee bolster. Refer to «Knee Bolster Replacement - Left»(/buick/lacrosse/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
  12. Remove the automatic transmission range selector cable from the shift control lever.
  13. Install a piece of mechanics wire to the end of the automatic transmission range selector cable.
  14. Remove the automatic transmission range selector cable through the hole in the cowl.

Installation Procedure

CAUTIONRefer to Automatic Transaxle Range Selector Cable Caution in Cautions and Notices.
  1. Install the automatic transmission range selector cable through the hole in the cowl.
  2. Remove the mechanics wire from the end of the automatic transmission range selector cable.
  3. If equipped with a steering column shift control, install the automatic transmission range selector cable to the shift control lever.
  4. Install the left knee bolster. Refer to «Knee Bolster Replacement - Left»(/buick/lacrosse/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
  5. If equipped with a floor console shift control, install the automatic transaxle range selector cable to the console shift control bracket.
  6. Install the automatic transaxle range selector cable to the console shift control.
  7. Install the automatic transaxle range selector cable retainer to the console shift control.
  8. Install the carpet into position. Refer to «Carpet Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  9. Install the Front Floor Console. Refer to «Console Replacement - Front Floor»(/buick/lacrosse/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
  10. Properly route and position the automatic transmission range selector cable.
  11. Install the automatic transaxle range selector cable to the automatic transaxle range selector cable bracket.
  12. Install the automatic transaxle range selector cable to the automatic transaxle range selector lever.
  13. Install the automatic transaxle range selector cable retainer.
  14. Place the transaxle in the Neutral position.
  15. Place the shift control in the Neutral position.
  16. Connect each cable section to the following before connecting the two cable sections. Insert the metal end fitting of the shift control cable into the transaxle cable end. Use the molded end fittings to push the metal end fitting of the shift control cable and the transaxle cable end together until the metal post snaps into place.
  17. Depress the adjuster clip once. This mobilizes the adjuster housing toward the transaxle end fitting.
  18. Line up the end fittings so they slide together until you feel the parts come together and lock.
  19. Depress the adjuster clip completely. This locks the cable into its adjusted service position.
  20. Pull the conduit in the opposite direction to assure full system adjustment of the shift cable.
  21. Ensure the conduit is fully engaged.
  22. The horseshoe clip with the tab is not flush when not fully engaged.
  23. Install the automatic transaxle range selector cable to the wiring harness clip or strap.
  24. Adjust the automatic transaxle range selector cable. Refer to «Automatic Transmission Range Selector Cable Adjustment»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__automatic-transmission-range-selector-cable-adjustment) .
  25. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.

Automatic Transmission Range Selector Cable Adjustment

  1. Set the parking brake.
  2. Block the wheels.
  3. Disconnect the shift cables at both ends with the system in Neutral.
  4. Push up to the adjustment position to release the adjuster until the cable housings separate.
  5. Depress the adjuster clip once. This mobilizes the adjuster housing toward the transaxle end fitting.
  6. Line up the end fittings so they slide together until you feel the parts cam together and lock.
  7. Depress the adjuster clip completely. This locks the cable into its adjusted service position.
  8. Pull the conduit in the opposite direction to assure full system adjustment of the shift cable.
  9. Ensure the conduit is fully engaged.
  10. The horseshoe clip with the tab is not flush when not fully engaged.
  11. Install the shift cable retainer and the wiring harness clip or wiring harness strap.
  1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  2. Remove the front floor console. Refer to «Console Replacement - Front Floor»(/buick/lacrosse/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
  3. Remove the left knee bolster. Refer to «Knee Bolster Replacement - Left»(/buick/lacrosse/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
  4. Place the transaxle shift control lever in the PARK position.
  5. Turn the ignition key to the RUN position.
  6. Using a screwdriver, release the cable from the ignition switch inhibitor by depressing the cable latch (1).
  7. Remove the cable from the inhibitor housing.
  8. Remove the cable from the shift control lever by sliding the cable reward off the park lever pin.
  9. Remove the cable at the shift control-housing base.
  10. Remove the park/lock cable.
  1. Ensure the shift lever is in the PARK position.
  2. Install the park/lock cable.
  3. Snap the cable into the shifter control-housing base.
  4. Ensure that the ignition key is in the RUN position.
  5. Install the cable into the inhibitor housing.
  6. Turn key to LOCK position.
  7. Install the cable on the shift control lever by sliding the cable over the park lever pin.
  8. Disengage the lock in the cable adjuster body by squeezing the release tabs and pulling away from the adjuster body. Cable should be freely within the adjuster body.
  9. Push the cable adjustment feature until all slack is removed from cable and no gap exists between cable end and adjustment feature.
  10. Depress cable lock.
  11. Inspect the functional operation of the park/lock cable. Refer to «Park Lock Cable Adjustment»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__park-lock-cable-adjustment) .
  12. Install the left knee bolster. Refer to «Knee Bolster Replacement - Left»(/buick/lacrosse/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
  13. Install the front floor console. Refer to «Console Replacement - Front Floor»(/buick/lacrosse/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
  14. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.

Park Lock Cable Adjustment

  1. Place the shift lever in the PARK position.
  2. Place the ignition key in the LOCK position.
  3. Ensure the shift lever cannot move to another position. The ignition key should be removable from the column.
  4. Place the ignition key in the RUN position.
  5. Place the shift lever in the NEUTRAL position.
  6. Ensure that the ignition key cannot turn to the LOCK position.
  7. The system is properly adjusted if the above conditions are met. Proceed to Step 13.
  8. If the above conditions are not met proceed to Step 9.
  9. Pull the cable connector lock back to the UP position.
  10. Readjust the cable connector as outlined. Push the cable connector nose forward in order to remove the slack. Snap the cable connector lock button down using no load applied to the connector nose.
  11. Push the cable connector lock button down.
  12. Retest the operation.
  13. If the ignition key cannot be removed in the PARK position, then snap the connector lock button to the UP position.
  14. Move the cable connector nose rearward until the key can be removed from the ignition.
  15. Snap the lock button down.
  16. Reinstall the cable into the clips in order to provide the correct routing.
  1. Remove the transaxle oil level indicator.
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  3. Remove the catalytic converter from the exhaust manifold. Refer to «Catalytic Converter Replacement»(/buick/lacrosse/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
  4. Remove the fluid filler tube bracket bolt.
  5. Remove the fluid filler tube.
  1. Install the fluid filler tube seal in the transaxle.
  2. Position the fluid filler tube.
  3. Install the fluid filler tube bracket bolt. Tighten: Tighten the bolt to 13 N.m (115 lb in).
  4. Install the catalytic converter. Refer to «Catalytic Converter Replacement»(/buick/lacrosse/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
  5. Lower the vehicle.
  6. Check and fill the transaxle as necessary.
  7. Install the transaxle oil level indicator.
  8. Inspect for fluid leaks.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the right front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  3. Disconnect the vehicle speed sensor (VSS) electrical connector.
  4. Remove the VSS bolt (9).
  5. Remove the VSS (10) from the extension case.
  6. Remove the O-ring (11) from the VSS (10).
  1. Install the O-ring (11) to the VSS (10).
  2. Install the VSS (10).
  3. Install the VSS bolt (9). Tighten: Tighten the bolt (9) to 12 N.m (106 lb in).
  4. Connect the VSS electrical connector.
  5. Install the right front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  6. Lower the vehicle.
  1. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.
  2. Remove the exhaust flange crossover pipe and heat shield. Refer to «Exhaust Crossover Pipe Replacement»(/buick/lacrosse/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
  3. Depress the reverse servo cover (40).
  4. Remove the snap ring (39).
  5. Pull the O-ring seal (41) out through the slot in the case.
  6. Use side cutting pliers in order to cut the servo cover O-ring seal (41).
  7. Depress the reverse servo cover (40), grasp one end of the cut seal (41) and pull the seal (41) out of the servo cover (40).
  8. Remove the right exhaust manifold. Refer to «Exhaust Manifold Replacement - Right»(/buick/lacrosse/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
  9. Remove the reverse servo cover (40).
  10. Remove the servo assembly (42-48).
  11. Remove the servo spring (49).
  1. Jack up the driver side (channel plate side) of the car until it is higher than the differential side. This ensures that the reverse band is in the proper location and not cocked to the channel plate side of the case.
  2. Install the servo spring (49).
  3. Install the servo assembly (42-48).
  4. Install the reverse servo cover (40) with new O-ring seal (41).
  5. Install the right exhaust manifold. Refer to «Exhaust Manifold Replacement - Right»(/buick/lacrosse/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
  6. Depress the reverse servo cover.
  7. Install the snap ring (39).
  8. Install the exhaust flange crossover pipe and heat shield. Refer to «Exhaust Crossover Pipe Replacement»(/buick/lacrosse/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
  9. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.
  1. Install the engine support fixture. Refer to «Engine Support Fixture»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-36l-ly7-repair-instructions-1-of-5) in Engine Mechanical - 3.6L or «Engine Support Fixture»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical - 3.8L.
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  3. Remove and support the power steering gear. Refer to «Power Steering Gear Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) in Power Steering System.
  4. Remove the transaxle mount lower nuts. Refer to «Transmission Mount Replacement - Left»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  5. Remove the engine mount lower nuts. Refer to «Engine Mount Replacement - Right»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-36l-ly7-repair-instructions-1-of-5) in Engine Mechanical - 3.6L or «Engine Mount Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical - 3.8L.
  6. Remove the power steering lines from the right side of the frame.
  7. Support the rear of the frame with a jackstand.
  8. Loosen the front frame bolts and remove the rear frame bolts. Refer to «Frame Replacement»(/buick/lacrosse/i-2004-2009/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.
  9. Adjust the jackstand to lower the rear of the frame.
  10. Position a drain pan under the forward servo cover.
  11. Remove the servo cover bolts.
  12. Remove the forward servo cover.
  13. Remove the forward servo cover O-ring.
  14. Remove the servo piston assembly.
  15. Remove the servo spring.
  1. Install the servo spring.
  2. Install the piston assembly.
  3. Install the O-ring.
  4. Install the servo cover.
  5. Install the forward servo cover bolts. Tighten: Tighten the bolts to 12 N.m (106 lb in).
  6. Remove the drain pan from under the forward servo cover.
  7. Adjust the jackstand to raise the rear of the frame.
  8. Install the frame bolts. Refer to «Frame Replacement»(/buick/lacrosse/i-2004-2009/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.
  9. Remove the support from the rear of the frame.
  10. Install the power steering lines to the right side of the frame.
  11. Install the engine mount lower nuts. Refer to «Engine Mount Replacement - Right»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-36l-ly7-repair-instructions-1-of-5) in Engine Mechanical - 3.6L or «Engine Mount Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical - 3.8L.
  12. Install the transaxle mount lower nuts. Refer to «Transmission Mount Replacement - Left»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  13. Install the power steering gear. Refer to «Power Steering Gear Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) in Power Steering System.
  14. Lower the vehicle.
  15. Remove the engine support fixture.
  16. Check and fill the transaxle as necessary.

Tools Required

  1. J 34115 Left Side Axle Seal Installer. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  2. J 37292-B Axle Seal Protector. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the left front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  3. Remove the left stabilizer shaft link from the left lower control arm. Refer to «Stabilizer Shaft Link Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  4. Remove the left tie rod end from the left steering knuckle. Refer to «Steering Knuckle Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  5. Remove the left lower ball joint from the left steering knuckle. Refer to «Steering Knuckle Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  6. Remove the left drive axle from the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  7. Secure the left drive axle to the left steering knuckle and the strut.
  8. Use a flat bladed screwdriver or a suitable tool to remove the oil seal (409) from the transaxle side case (401).
  1. Lubricate the seal lip with transaxle fluid.
  2. Install J 37292-B in the seal (409). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  3. Use J 34115 to install the new seal. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  4. Remove the J 37292-B . See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  5. Install the drive axle to the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  6. Install the left lower ball joint to the left steering knuckle. Refer to «Steering Knuckle Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  7. Install the left tie rod end to the left steering knuckle. Refer to «Steering Knuckle Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  8. Install the left stabilizer shaft link to the left lower control arm. Refer to «Stabilizer Shaft Link Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  9. Install the left front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  10. Lower the vehicle.
  11. Adjust the fluid level.
  12. Inspect for proper completion of the repairs.
  13. Inspect for proper fluid level.
  14. Inspect for fluid leaks.
  1. J 6125-B Slide Hammer. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  2. J 23129 Universal Seal Remover. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  3. J 29130 Axle Shaft Seal Installer. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  4. J 37292-B Axle Seal Protector. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the right front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  3. Remove the right stabilizer shaft link from the right lower control arm. Refer to «Stabilizer Shaft Link Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  4. Remove the right tie rod end from the right steering knuckle. Refer to «Steering Knuckle Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  5. Remove the right lower ball joint from the right steering knuckle. Refer to «Steering Knuckle Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  6. Remove the right drive axle from the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  7. Secure the right drive axle to the right steering knuckle and the strut.
  8. Use the J 6125-B (3) and the J 23129 (4) to remove the oil seal (1) from the extension housing (2). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  1. Lubricate the seal lip with transaxle fluid.
  2. Install J 37292-B in the seal (4). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  3. Use J 29130 to install the new seal (4). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  4. Remove the J 37292-B . See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  5. Install the drive axle to the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  6. Install the right lower ball joint to the right steering knuckle. Refer to «Steering Knuckle Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  7. Install the right tie rod end to the right steering knuckle. Refer to «Steering Knuckle Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  8. Install the right stabilizer shaft link to the right steering knuckle. Refer to «Stabilizer Shaft Link Replacement»(/buick/lacrosse/i-2004-2009/remont/suspension-front/#front-suspension-system) in Front Suspension.
  9. Install the right front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  10. Lower the vehicle.
  11. Check and fill the transaxle fluid as necessary.
  12. Inspect for fluid leaks.
  1. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.
  2. Remove the line pressure pipe plug (38).
  1. Apply GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the line pressure pipe plug.
  2. Install the line pressure pipe plug (38). Tighten: Tighten the plug to 11 N.m (97 lb in).
  3. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.
  1. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.
  2. Remove the transaxle vent (37).
  1. Install the transaxle vent (37).
  2. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Place a drain pan under the transaxle oil pan.
  3. Remove the transaxle oil pan bolts (23) from the front and the sides of the oil pan.
  4. Loosen the rear transaxle oil pan bolts.
  5. Use a rubber mallet to lightly tap the oil pan or use a screwdriver to pry the oil pan loose.
  6. Allow the fluid to drain.
  7. Remove the remaining transaxle bolts (23).
  8. Remove the oil pan (24) from the automatic transmission.
  9. Remove the oil pan gasket (25).
  10. Inspect the oil pan and the filter for the following foreign material: Metal particles Clutch facing material Rubber particles Engine coolant
  11. Determine the source of the contamination.
  12. Correct the source of the contamination.
  13. Inspect the oil pan flange (1) for distortion.
  14. Replace the oil pan (1) if bent or distorted. Do not attempt to straighten.
  15. When service requires the removal of the bottom oil, inspect the washers on the oil pan bolts.
  16. If the washer is inverted, replace the bolt and the washer.
  17. Use solvent to clean the case.
  18. Air dry the case.
  19. Use solvent to clean the oil pan gasket surfaces.
  20. Air dry the oil pan gasket surfaces.
  21. Remove all traces of the old gasket material.
  1. Install the oil pan gasket (25).
  2. Install the oil pan (24).
  3. Install the oil pan bolts (23). Tighten: Tighten the bolts to 14 N.m (10 lb ft).
  4. Lower the vehicle.
  5. Fill the transaxle with DEXTRON® III. Refer to «Fluid Capacity Specifications»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__fluid-capacity-specifications) .
  6. Place the gear selector in the Park position.
  7. Start the engine.
  8. Run the engine at a slow idle. Do NOT race the engine.
  9. Adjust the fluid level.
  10. Inspect for leaks.
  1. Remove the oil pan (24) and the gasket (25). Refer to «Oil Pan Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Remove the filter (100). Remove the lip ring seal (101) pressed into the case only if replacement is necessary.
  3. Inspect the oil pan and the filter for the following foreign material: metal particles clutch facing material rubber particles engine coolant
  4. Determine the source of the contamination if foreign material is evident.
  5. Correct the source of the contamination.
  1. If removed, install a new seal (101).
  2. Install the filter (100).
  3. Install the gasket (25) and the oil pan (24). Refer to «Oil Pan Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the filter. Refer to «Oil Filter and Seal Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  3. Remove the accumulator bolts (131).
  4. Remove the manual 2-1 band servo cover bolts (103).
  5. Remove the accumulator assembly.
  6. Remove the manual 2-1 band servo (106-116).
  1. Install the manual 2-1 band servo (106-116).
  2. Install the accumulator assembly.
  3. Install the manual 2-1 band servo cover bolts (103). Tighten: Tighten the bolts to 25 N.m (18 lb ft).
  4. Install the accumulator cover bolts (131). Tighten: Tighten the bolts to 12 N.m (106 lb in).
  5. Install the filter. Refer to «Oil Filter and Seal Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  6. Lower the vehicle.

J 34094-A Thermo Element Height Gage. See Special Tools .

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the oil pan. Refer to «Oil Pan Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  3. Remove the thermo element pins (120, 123) and the washers.
  4. Remove the thermo element (121) and the thermo element plate (122).
  1. Use the J 34094-A to set the middle thermo pin (123). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  2. Install the new thermo element plate (122).
  3. Install the pin (120) and the washer.
  4. Use the J 34094-A to set the height of the pin and the washer furthest from the accumulator. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  5. Use the J 34094-A to set the height of the second pin (120) and the washer. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  6. Install the thermo element (121) between the two pins (120). The V in the thermo element (121) must contact the thermo element plate (122).
  7. Install the oil pan. Refer to «Oil Pan Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  8. Lower the vehicle.
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Use a small flat-bladed tool in order to remove the wiring harness from the solenoid valve (315A, 315B, 322, 334 and/or 440), TFP manual valve position switch (395) and the temperature sensor (391).
  3. Remove the wiring harness (224).
  1. Install the wiring harness (224).
  2. Install the wiring harness to the solenoid valve (315A, 315B, 322, 334 and/or 440), TFP manual valve position switch (395) and the temperature sensor (391).
  3. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .

J 36850 Transjel Lubricant. See Special Tools .

  1. Remove the engine dress cover.
  2. Disconnect the MAF sensor harness connector from the MAF and disconnect the air intake duct from throttle body.
  3. Disconnect the EVAP emission hose from the EVAP valve.
  4. Remove the shift cable from the transaxle range selector.
  5. Remove the transaxle shift cable bracket bolts and the bracket from the transaxle.
  6. Disconnect the transaxle wiring harness connector.
  7. Remove both engine supports from the engine and radiator support.
  8. Remove top side cover bolt (56,58).
  9. Install the engine support fixture. Refer to «Engine Support Fixture»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical - 3.8L.
  10. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  11. Remove the left front wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  12. Remove the inner fender splash shield.
  13. Remove the wheel speed sensor harness from 4 retainers on lower control arm.
  14. Remove the transmission mount-to-frame nuts (2).
  15. Using side cutters, remove the plastic pencil-like support on the left side of the front splash shield, just below the left front frame bolt.
  16. Remove the front cradle to radiator support brackets on each side.
  17. Remove both stabilizer links from the stabilizer and reposition stabilizer to access steering gear- to-frame bolts.
  18. Remove steering gear-to-frame bolts and support steering gear.
  19. Remove the positive battery cable center retainer at front rail.
  20. Remove the left side ball joint from the steering knuckle.
  21. Support the left frame rail with a jack stand.
  22. Remove only the left two frame-to-body bolts. DO NOT LOOSEN RIGHT SIDE FRAME-TO-BODY BOLTS.
  23. Lower the frame with jack stand and remove jack stand.
  24. Position the drain pan under transaxle side cover.
  25. Remove the left drive axle from the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  26. Secure the drive axle to the strut assembly.
  27. Lower the vehicle.
  28. Using the engine support fixture lower the engine assembly to access the transaxle case side cover.
  29. Raise the vehicle.
  30. Remove the transaxle mount bracket bolts and the bracket from the transaxle.
  31. Remove the remaining case side cover bolts (56,57,58).
  32. Remove the case side cover (53).
  33. Remove the case side cover gasket (54).
  34. Remove the case side cover O-ring (59).
  35. Clean the side cover gasket mating surfaces.
  1. Install the J 36850 Transjel Lubricant to the case side cover O-ring (59). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  2. Install the O-ring (59) to the case side cover.
  3. Install the case side cover gasket (54).
  4. Install the case side cover (53).
  5. Install the case side cover bolts (56,57,58) except top bolt. Tighten: Tighten bolts to 25 N.m (18 lb ft).
  6. Install the transaxle mount bracket
  7. Install the transaxle mount bracket bolts. Tighten: Tighten the bolts to 95 N.m (70 lb ft)
  8. Install a jack stand under the left frame rail and raise frame while aligning transaxle mount bolts with frame and ball joint with the steering knuckle.
  9. Install and tighten the left side frame-to-body bolts (2).
  10. Install front cradle to radiator support brackets and bolts to both sides.
  11. Install drive axle to transaxle.
  12. Install transaxle mount nuts (2).
  13. Install the ball joint nut and cotter pin.
  14. Install the steering gear-to-frame bolts.
  15. Install the positive battery cable center retainer on front frame rail.
  16. Reposition the stabilizer bar and install bolts to stabilizer.
  17. Install the wheel speed sensor harness to four retainers on the lower control arm.
  18. Install the inner fender splash shield.
  19. Install the left front wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  20. Lower the vehicle and remove the engine support fixture.
  21. Install the top case side cover bolt. Tighten: Tighten bolts to 25 N.m (18 lb ft).
  22. Install the transaxle shift cable bracket and shift cable bracket bolts. Tighten: Tighten the bolts to 30 N.m (22 lb ft).
  23. Install the transaxle shift cable to the transaxle range selector.
  24. Connect the transaxle wiring harness connector.
  25. Install the engine mount struts. Refer to «Engine Mount Strut Replacement - Right»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) and «Engine Mount Strut Replacement - Left»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical - 3.8L.
  26. Install the air intake duct and connect the MAF sensor wiring harness.
  27. Install the EVAP hose to EVAP valve.
  28. Install the engine dress cover.
  29. Check and fill the transaxle as necessary.
  30. Inspect for fluid leaks.
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Disconnect the torque converter clutch (TCC) solenoid electrical connector.
  3. Remove the TCC solenoid retaining clip (314)
  4. Remove the TCC solenoid (315).
  1. Install the TCC solenoid (315).
  2. Install the TCC solenoid retaining clip (314).
  3. Connect the TCC solenoid electrical connector.
  4. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Disconnect the wiring harness assembly from the fluid temperature sensor (391).
  3. Remove the fluid temperature sensor (391).
  1. Install the fluid temperature sensor (391).
  2. Connect the wiring harness assembly to the with fluid temperature sensor (391).
  3. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Disconnect and reposition the electrical connectors from the following: If equipped internal mode switch 2 - 3 Shift solenoid valve assembly (315B) Automatic transaxle fluid pressure manual valve position switch assembly (395)
  3. Remove the oil pump bolts (206,207).
  4. Remove the oil pump (200) from the valve body (300).
  5. Disconnect the torque converter clutch pulse width modulation (TCC PWM) solenoid electrical connector.
  6. Remove the TCC PWM solenoid retaining clip (314F).
  7. Remove the TCC PWM solenoid (334).
  1. Install the TCC PWM solenoid (334).
  2. Install the TCC PWM solenoid retaining clip (314F).
  3. Connect the TCC PWM solenoid electrical connector.
  4. Install the oil pump (200) to the valve body (300).
  5. Install the oil pump body and cover bolts (206,207). Tighten: Tighten the bolts (207) to 12 N.m (106 lb in). Tighten the bolts (206) to 16 N.m (12 lb ft).
  6. Reposition and connect the electrical connectors to the following: Automatic transaxle fluid pressure manual valve position switch assembly (395) 2 - 3 Shift solenoid valve assembly (315B) If equipped internal mode switch
  7. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Disconnect the 1-2 shift solenoid electrical connector.
  3. Remove the 1-2 shift solenoid retaining clip (314D)
  4. Remove the 1-2 shift solenoid (315A).
  1. Install the 1-2 shift solenoid (315A).
  2. Install the 1-2 shift solenoid retaining clip (314D).
  3. Connect the 1-2 shift solenoid electrical connector.
  4. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Disconnect the 2-3 shift solenoid electrical connector.
  3. Remove the 2-3 shift solenoid retaining clip (314C).
  4. Remove the 2-3 shift solenoid (315B) and the O-ring (316).
  1. Install the O-ring (316) and the 2-3 shift solenoid (315B).
  2. Install the 2-3 shift solenoid retaining clip (314C).
  3. Connect the 2-3 shift solenoid electrical connector.
  4. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Disconnect the input speed sensor electrical connector.
  3. Remove the input speed sensor retaining clip (441).
  4. Remove the input speed sensor (440).
  5. Inspect the input speed sensor (440) for the following conditions: Damaged or missing magnet Damaged housing Bent or missing electrical terminals Damaged speed sensor clip (441)
  1. Install the input speed sensor (440).
  2. Install the input speed sensor retaining clip (441).
  3. Connect the input speed sensor electrical connector.
  4. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Disconnect the pressure control solenoid (PCS) electrical connector.
  3. Remove the PCS retaining clip (314E).
  4. Remove the PCS (322).
  1. Install the PCS (322).
  2. Install the PCS retaining clip (314E).
  3. Connect the PCS electrical connector.
  4. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Disconnect the transaxle wiring harness.
  3. Remove the control valve body bolts (375, 379, 381) that mount the fluid pressure manual valve position switch to the control valve body (300).
  4. Carefully remove the fluid pressure manual valve position switch (395).
  5. Inspect the fluid pressure manual valve position switch (395) for the following conditions: Damaged electrical connector terminals Damaged seals Damaged switch membranes Debris on the switch membranes
  1. Carefully install the fluid pressure manual valve position switch (395).
  2. Install the control valve body bolts (375, 379, 381) that mount the TFP switch to the control valve body (300). Tighten: Tighten the control valve body bolt (375) to 12 N.m (106 lb in). Tighten the control valve body bolt (379) to 16 N.m (12 lb ft). Tighten the control valve body bolt (381) to 8 N.m (70 lb in).
  3. Connect the transaxle wiring harness.
  4. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Use a flat-bladed tool to disconnect the electrical connectors from the solenoid valves (315A, 315B, 322, 334 and 440), the TFP manual valve position switch (395) and the temperature sensor (391).
  3. Remove the oil pump bolts (206,207).
  4. Remove the oil pump (200) from the valve body (300).
  1. Install the oil pump (200) to the valve body (300).
  2. Install the oil pump bolts (206,207). Tighten: Tighten the M6 X 1.0 X 85 bolts (207) to 12 N.m (106 lb in). Tighten the M6 X 1.0 X 95 bolts (206) to 16 N.m (12 lb ft).
  3. Connect the electrical connectors to the solenoid valves (315A, 315B, 322, 334 and 440), the TFP manual valve position switch (395) and the temperature sensor (391).
  4. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .

J 36850 Transjel Lubricant. See Special Tools .

  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Remove the oil pump. Refer to «Oil Pump Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  3. Remove the valve body bolts (374-381,384).
  4. Remove the valve body (300) while keeping the spacer plate and gasket assembly (396) with the transaxle.
  5. Remove the ball check valves (372 and 373) from the valve body.
  6. Remove the spacer plate and gasket assembly (396).
  7. Remove the ball check valves (372) from the case cover.
  8. Inspect each check valve seat in the spacer plate (370) for excessive peening. Place a ball check valve (372) on each seat and use a flashlight in order to look for visible light between the valve and the seat.
  1. Install the ball check valves (372) into the case cover. Use the J 36850 to retain the ball check valves in their proper locations. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  2. Install the gasket and spacer plate assembly (396).
  3. Install the ball check valves (372 and 373) into the valve body. Use the J 36850 to retain the ball check valves in their proper locations. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  4. Install the spacer plate/gasket assembly (396) and the valve body (300).
  5. Install the valve body bolts (374-381, 384). Tighten: Tighten the M6 X 1.0 X 20 bolt (381) to 8 N.m (70 lb in). Tighten the M6 X 1.0 X 30 bolt (376) to 12 N.m (106 lb in). Tighten the M6 X 1.0 X 45 bolt (377) to 12 N.m (106 lb in). Tighten the M6 X 1.0 X 55 bolt (378) to 12 N.m (106 lb in). Tighten the M6 X 1.0 X 60 bolt (375) to 12 N.m (106 lb in). Tighten the M6 X 1.0 X 65 bolt (374) to 12 N.m (106 lb in). Tighten the M6 X 1.0 X 85 bolt (384) to 12 N.m (106 lb in). Tighten the M6 X 1.0 X 95 bolt (379) to 16 N.m (11 lb ft). Tighten the M8 X 1.25 X 90 bolt (380) to 25 N.m (18 lb ft).
  6. Install the oil pump. Refer to «Oil Pump Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  7. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Remove the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Remove the oil reservoir weir (27).
  1. Install the oil reservoir weir (27).
  2. Install the case side cover. Refer to «Case Side Cover Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  3. Remove the right drive axle from the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  4. Remove the transaxle brace. Refer to «Automatic Transmission Brace Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  5. Remove the vehicle speed sensor. Refer to «Vehicle Speed Sensor (VSS) Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  6. Remove the case extension housing bolts (5).
  7. Remove the case extension housing (6) with the axle seal and the O-ring (8).
  1. Install the O-ring (8) to the case extension housing (6).
  2. Install the case extension housing (6) with the axle seal and the O-ring (8).
  3. Install the case extension housing bolts (5). Tighten: Tighten the bolts to 36 N.m (27 lb ft).
  4. Install the vehicle speed sensor. Refer to «Vehicle Speed Sensor (VSS) Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  5. Install the transaxle brace. Refer to «Automatic Transmission Brace Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  6. Install the right drive axle to the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  7. Lower the vehicle.
  8. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  9. Check and fill the transaxle as necessary.
  10. Inspect for fluid leaks.

J 42562 Axle Removal Wedge. See Special Tools .

  1. Remove the case extension housing. Refer to «Case Extension Housing Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Remove the left drive axle from the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  3. Rotate the differential carrier until the end of the output shaft can be seen and the differential pinion shaft (701) is in a horizontal position.
  4. Place the J 42562 between the end of the output shaft and the differential pinion shaft. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  5. Using a hammer, hit the end of the axle removal tool in order to compress the output shaft compression ring (512) and push the output shaft through the differential side gear.
  6. Remove the differential carrier (700).
  7. Using snap ring pliers remove the compression ring (512) from the output shaft.
  8. Remove the output shaft (510) through the left wheel opening.
  9. Remove the sun gear thrust bearing (698) from the differential carrier sun gear. The bearing may be stuck to the differential carrier.
  10. Remove the differential carrier sun gear (697).
  11. Remove the park gear (696).
  12. Remove the internal gear thrust bearing (695) from the differential carrier internal gear.
  13. Remove the sun gear shaft (689.)
  1. Assemble the sun gear thrust bearing (698), the differential carrier sun gear (697), the park gear (696), the internal gear thrust bearing (695) and the sun gear shaft (689) into the differential carrier (700).
  2. Install the differential carrier into the case.
  3. Install the drive axle retainer rings (509) to the output shaft (510).
  4. Hold the front differential carrier in place and carefully install the output shaft to the transmission through the left wheel opening.
  5. Install the case extension housing. Refer «Case Extension Housing Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  6. Install left drive axle to the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.

Tool Required

J 42562 Axle Removal Wedge. See Special Tools .

  1. Remove the case extension housing. Refer to «Case Extension Housing Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Remove the left drive axle from the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) .
  3. Rotate the differential carrier until the end of the output shaft can be seen and the differential pinion shaft (701) is in a horizontal position.
  4. Place the J 42562 between the end of the output shaft and the differential pinion shaft. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2__special-tools) .
  5. Using a hammer, hit the end of the axle removal tool in order to compress the output shaft compression ring (512) and push the output shaft through the differential side gear.
  6. Remove the differential carrier (700).
  7. Using snap ring pliers remove the compression ring (509) from the output shaft.
  8. Remove the output shaft through the left wheel opening.
  9. Inspect the output shaft (510) for the following: Stripped splines Damaged retainer ring groove Damaged bushing journals
  1. Install the drive axle retainer rings (509) to the output shaft (510).
  2. Hold the front differential carrier in place and carefully install the output shaft (510) to the transmission through the left wheel opening. Extend the output shaft through the differential side gear.
  3. Install the case extension housing. Refer to «Case Extension Housing Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  4. Install the left drive axle to the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) .
  1. Disconnect the transaxle oil cooler (TOC) outlet hose from top side of the radiator. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  3. Remove the TOC hose retainer bolt.
  4. Position a drain pan below the oil cooler hoses.
  5. Disconnect the TOC outlet hose from the transaxle. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  6. Disconnect the TOC inlet hose from the transaxle. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  7. Disconnect the TOC inlet hose from the radiator. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  8. Disconnect the TOC hoses from the radiator support retainer.
  9. Remove the TOC hoses from the vehicle.

Note. Allow sufficient clearance around the transaxle oil cooler pipes and around the hoses to prevent damage or wear which may cause fluid loss.

  1. Install the TOC hoses to the vehicle.
  2. Connect the TOC hoses to the radiator support retainer.
  3. Connect the TOC inlet hose to the radiator. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  4. Connect the TOC inlet hose to the transaxle. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  5. Connect the TOC outlet hose to the transaxle. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  6. Install the TOC hose retainer and the bolt. Tighten: Tighten the bolt to 25 N.m (18 lb ft).
  7. Lower the vehicle.
  8. Connect the TOC outlet hose to the top side of the radiator. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  9. Adjust the fluid level. Refer to the following procedures: «Transmission Fluid Checking Procedure»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#how-to-diagnosis-troubleshooting-the-automatic-transaxle-4t65-e-service__transmission-fluid-checking-procedure) «Fluid and Lubricant Recommendations»(/buick/lacrosse/i-2004-2009/remont/lubrication-system/#maintenance-and-lubrication__fluid-and-lubricant-recommendations) in Maintenance and Lubrication «Capacities - Approximate Fluid»(/buick/lacrosse/i-2004-2009/remont/lubrication-system/#maintenance-and-lubrication__capacities-approximate-fluid) in Maintenance and Lubrication
  1. Pull the plastic cap back from the quick connect fitting and down along the cooler line about 5 cm (2 in).
  2. Using a bent-tip screwdriver, pull on one of the open ends of the retaining ring in order to rotate the retaining ring around the quick connect fitting until the retaining ring is out of position and can be completely removed.
  3. Remove the retaining ring from the quick connect fitting.
  4. Discard the retaining ring.
  5. Pull the cooler line straight out from the quick connect fitting.
  1. Install a new retaining ring into the quick connect fitting using the following procedure
  2. Hook one of the open ends of the retaining ring in one of the slots in the quick connect fitting.
  3. Rotate the retaining ring around the fitting until the retaining ring is positioned with all three ears through the three slots on the fitting.
  4. Do not install the new retaining ring onto the fitting by pushing the retaining ring.
  5. Ensure that the three retaining ring ears are seen from inside the fitting and that the retaining ring moves freely in the fitting slots.
  6. Install the cooler line into the quick connect fitting.
  7. Insert the cooler line end into the quick connect fitting until a click is either heard or felt.
  8. Do not use the plastic cap on the cooler line in order to install the cooler line into the fitting.
  9. Pull back sharply on the cooler line in order to ensure that the cooler line is fastened into the quick connect fitting.
  10. Position (snap) the plastic cap onto the fitting. Do not manually depress the retaining ring when installing the plastic cap onto the quick connect fitting.
  11. Ensure that the plastic cap is fully seated against the fitting.
  12. Ensure that no gap is present between the cap and the fitting.
  13. Ensure that the yellow identification band on the tube is hidden within the quick connect fitting.
  14. A hidden yellow identification band indicates proper joint seating.
  15. Fill the transmission to the proper level with DEXRON® III transmission fluid. Refer to «Transmission Fluid Checking Procedure»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#how-to-diagnosis-troubleshooting-the-automatic-transaxle-4t65-e-service__transmission-fluid-checking-procedure) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Position a drain pan under the vehicle.
  3. Remove the oil cooler hoses from the transaxle oil cooler fittings. Refer to «Automatic Transmission Oil Cooler Hose Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  4. Remove the oil cooler fittings (28,29) from the transaxle.
  1. Install the oil cooler fittings (28,29) to the transaxle. Tighten: Tighten the fittings to 38 N.m (28 lb ft).
  2. Install the oil cooler hoses to the transaxle oil cooler fittings. Refer to «Automatic Transmission Oil Cooler Hose Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  3. Lower the vehicle.
  4. Adjust the fluid level.
  5. Inspect for fluid leaks. Refer to «Fluid Leak Diagnosis»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#how-to-diagnosis-troubleshooting-the-automatic-transaxle-4t65-e-service) .
  6. Remove the drain pan from under the vehicle.
  1. Drain the cooling system. Refer to «Draining and Filling Cooling System (L26 Static Fill)»(/buick/lacrosse/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) , «Draining and Filling Cooling System (LY7 Static Fill)»(/buick/lacrosse/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) or «Draining and Filling Cooling System (L26, LY7, GE 47716 Fill)»(/buick/lacrosse/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) in Engine Cooling.
  2. Remove the transaxle oil cooler hoses from the oil cooler fittings on the radiator. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  3. Remove the oil cooler fitting from the radiator.
  1. Inspect the new O-ring seals for cracks, cuts or damage. Replace if necessary.
  2. Install the oil cooler fitting to the radiator Tighten: Tighten the fittings to 38 N.m (28 lb ft).
  3. Install the transaxle oil cooler hoses to the oil cooler fittings on the radiator. Refer to «Transmission Fluid Cooler Line Quick Connect Fitting»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  4. Fill the cooling system. Refer to «Draining and Filling Cooling System (L26 Static Fill)»(/buick/lacrosse/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) , «Draining and Filling Cooling System (LY7 Static Fill)»(/buick/lacrosse/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) or «Draining and Filling Cooling System (L26, LY7, GE 47716 Fill)»(/buick/lacrosse/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) in Engine Cooling.
  5. Adjust the transmission fluid level.
  6. Inspect for fluid leaks.

Transmission Mount Inspection

Note. In order to avoid oil pan damage and possible engine failure, insert a block of wood that spans the width of the oil pan bottom between the oil pan and the jack support.

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Place a jackstand under the transmission/transaxle.
  3. Place a block of wood between the jack stand and the transaxle in order to protect the transmission/transaxle pan.
  4. Raise the transmission/transaxle in order to remove the weight from the transmission/transaxle mount and create slight tension in the rubber.
  5. Observe the transmission/transaxle mount while raising the transmission/transaxle. Replace the transmission/transaxle mount if the transmission/transaxle mount exhibits any of the following conditions: The hard rubber surface is covered with heat check cracks. The rubber is separated from the metal plate of the transmission/transaxle mount. The rubber is split through the center of the transmission/transaxle mount.
  6. If there is movement between the metal plate of the transmission/transaxle mount and its attaching points, lower the transmission/transaxle on the transmission/transaxle mount. Tighten the bolts or nuts attaching the transmission/transaxle mount to the frame or transmission/transaxle mount bracket.
  7. Remove the Jack stand and block of wood from under the vehicle.
  8. Lower the vehicle.
  9. For information on the engine mount, refer to «Engine Mount Inspection»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-36l-ly7-repair-instructions-1-of-5__engine-mount-inspection) in Engine Mechanical - 3.6L and «Engine Mount Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical - 3.8L.
  1. Raise and support the vehicle.
  2. Remove the right front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  3. Remove the transaxle brace bolts.
  4. Remove the transaxle brace.
  1. Install the transaxle brace.
  2. Hand start the bolts to the engine and to the transaxle.
  3. Install the transaxle brace bolts to the transaxle. Tighten: Tighten the transaxle brace bolts to the transaxle to 43 N.m (32 lb ft).
  4. Install the transaxle brace bolts to the engine. Tighten: Tighten the transaxle brace bolts to the engine to 63 N.m (46 lb ft).
  5. Install the right front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  6. Lower the vehicle.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the left tire and wheel assembly.
  3. Remove left inner splash shield.
  4. Position a transmission jack under the transaxle.
  5. Remove the transaxle mount upper nuts from the transaxle bracket.
  6. Carefully raise the transaxle assembly.
  7. Remove the transaxle mount lower nuts from the frame.
  8. Remove the transaxle mount from the frame.
  1. Position the transaxle mount to the frame.
  2. Install the transaxle mount lower nuts to the frame. Tighten: Tighten the transaxle mount lower nuts to 63 N.m (46 lb ft).
  3. Lower the transaxle so the transaxle mount studs install into the transaxle bracket.
  4. Install the transaxle mount upper nuts to the transaxle mount. Tighten: Tighten the transaxle mount upper nuts to 47 N.m (35 lb ft).
  5. Remove the transmission jack from the transaxle.
  6. Install left inner splash shield.
  7. Install the left wheel and tire assembly.
  8. Lower the vehicle.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the left front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  3. Remove the left engine splash shield. Refer to «Splash Shield Replacement - Engine»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-front-end) Body Front End.
  4. Use floor stands to support the transaxle.
  5. With a jack, slightly take the weight off mount and remove the transaxle bracket to transaxle mount upper nuts.
  6. Remove the transaxle bracket to transaxle bolts.
  7. Remove the transaxle bracket.
  1. Position the transaxle bracket to the transaxle.
  2. Hand start the transaxle mount bracket to transaxle bolts.
  3. Install the transaxle bracket bolts. Tighten: Start with the forward lower bolt and work clockwise to tighten the transaxle bracket bolts to 95 N.m (70 lb ft).
  4. Remove the support from the transaxle.
  5. Install the transaxle bracket to the transaxle mount upper nuts. Tighten: Tighten the nuts to 47 N.m (35 lb ft).
  6. Install the left engine splash shield. Refer to «Splash Shield Replacement - Engine»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-front-end) Body Front End.
  7. Install the left front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  8. Lower the vehicle.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the torque converter cover bolts.
  3. Remove the torque converter covers.
  1. Install the torque converter covers.
  2. Install the torque converter cover bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in).
  3. Lower the vehicle.

J 37096 Flywheel Holder

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the torque converter cover bolts.
  3. Remove the torque converter covers.
  4. Install the J 37096 in order to gain access to the torque converter bolts and to prevent the flywheel from turning.
  5. Remove the flywheel to torque converter bolts.
  1. Install the J 37096 in order to gain access to the torque converter bolts and to prevent the flywheel from turning.
  2. Install the flywheel to torque converter bolts. Tighten: Tighten the bolts to 63 N.m (46 lb ft).
  3. Install the torque converter covers.
  4. Install the torque converter cover bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in)
  5. Lower the vehicle.

J 37096 Flywheel Holder

  1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  2. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction-2-of-2) in Engine Controls - 3.6L or «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.
  3. Disconnect the transaxle wiring harness electrical connector (4).
  4. Remove the wiring harness ground nut (3) from the transaxle.
  5. Remove the wiring harness grounds (1,2) from the transaxle.
  6. Remove the wiring harness ground bolt (6) from the transaxle.
  7. Remove the wiring harness grounds (5) from the transaxle.
  8. Remove the wiring harness bracket bolt (7) and reposition the wiring harness.
  9. Remove the range selector cable from the transaxle shift lever.
  10. Remove the range selector retainer from the cable.
  11. Remove the range selector cable from the transaxle.
  12. Remove the upper transaxle bolts (3,4,5) and the stud (2).
  13. Install the engine support fixture. Refer to «Engine Support Fixture»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical - 3.8L
  14. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  15. Remove the front wheels. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  16. Remove the left and the right engine splash shields. Refer to «Splash Shield Replacement - Engine»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-front-end) in Body Front End.
  17. Remove the frame from the vehicle. Refer to «Frame Replacement»(/buick/lacrosse/i-2004-2009/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.
  18. Remove the starter motor. Refer to «Starter Motor Replacement (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Motor Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  19. Install J 37096 in order to gain access to the torque converter bolts and to prevent the flywheel from turning.
  20. Remove the torque converter bolts.
  21. Remove the oil cooler pipes from the transaxle. Refer to «Automatic Transmission Oil Cooler Hose Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  22. Remove the left and the right wheel drive shafts from the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  23. Secure the drive shafts to the steering knuckles.
  24. Disconnect the electrical connector from the vehicle speed sensor.
  25. Position a transmission jack under the transaxle and secure the jack firmly to the transaxle.
  26. Remove the transaxle brace. Refer to «Automatic Transmission Brace Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  27. Remove the lower transaxle bolt (6) and the stud (1).
  28. Remove the transaxle from the vehicle.
  29. Transfer all necessary parts as needed.
  30. Flush the transmission cooler and lines. Refer to «Automatic Transmission Oil Cooler Flushing and Flow Test (J35944-A)»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#how-to-diagnosis-troubleshooting-the-automatic-transaxle-4t65-e-service__automatic-transmission-oil-cooler-flushing-and) or «Automatic Transmission Oil Cooler Flushing and Flow Test (J45096)»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#how-to-diagnosis-troubleshooting-the-automatic-transaxle-4t65-e-service__automatic-transmission-oil-cooler-flushing-and) .
  1. Position the transaxle onto a transmission jack and secure the transaxle to the jack.
  2. Install the transaxle into the vehicle.
  3. Install the lower transaxle bolt (6) and the stud (1). Tighten: Tighten the bolt and the stud to 75 N.m (55 lb ft).
  4. Install the transaxle brace. Refer to «Automatic Transmission Brace Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  5. Install J 37096 in order to gain access to install the torque converter bolts and to prevent the flywheel from turning.
  6. Install the torque converter bolts. Tighten: Tighten the bolts to 63 N.m (46 lb ft).
  7. Install the wheel drive shafts into the transaxle. Refer to «Wheel Drive Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/axle-shafts/#wheel-drive-shafts) in Wheel Drive Shafts.
  8. Install the oil cooler pipes to the transaxle. Refer to «Automatic Transmission Oil Cooler Hose Replacement»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#automatic-transaxle-4t65-e-introduction-2-of-2) .
  9. Install the starter motor. Refer to «Starter Motor Replacement (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Motor Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  10. Remove the transmission jack from the transaxle.
  11. Install the frame to the vehicle. Refer to «Frame Replacement»(/buick/lacrosse/i-2004-2009/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.
  12. Connect the electrical connector to the vehicle speed sensor.
  13. Install the left and the right engine splash shield. Refer to «Splash Shield Replacement - Engine»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-front-end) in Body Front End.
  14. Install the front wheels. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  15. Lower the vehicle.
  16. Remove the engine support fixture.
  17. Install the upper transaxle bolts (3,4,5) and the stud (2). Tighten: Tighten the bolts and the stud to 75 N.m (55 lb ft).
  18. Install the cable to the transaxle range selector cable bracket.
  19. Install the A/T range selector cable retainer to the cable.
  20. Install the transaxle range selector cable to the transaxle shift lever.
  21. Reposition the wiring harness and install the wiring harness bracket and the bolt (7). Tighten: Tighten the bolt to 25 N.m (18 lb ft).
  22. Install the wiring harness grounds (5) to the transaxle.
  23. Install the transaxle wiring harness ground bolt (6) to the transaxle. Tighten: Tighten the bolt to 25 N.m (18 lb ft).
  24. Install the wiring harness grounds (1,2) to the transaxle.
  25. Install the wiring harness ground nut (3) to the transaxle. Tighten: Tighten the nut to 45 N.m (33 lb ft).
  26. Connect the transaxle wiring harness electrical connector (4).
  27. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction-2-of-2) in Engine Controls - 3.6L or «Air Cleaner Intake Duct Replacement»(/buick/lacrosse/i-2004-2009/remont/testing-diagnostics/#engine-control-system-38l-introduction-2-of-2) in Engine Controls - 3.8L.
  28. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  29. Fill the transaxle with transmission fluid.
  30. Inspect the transaxle for fluid leaks. Refer to «Fluid Leak Diagnosis»(/buick/lacrosse/i-2004-2009/remont/automatic-trans/#how-to-diagnosis-troubleshooting-the-automatic-transaxle-4t65-e-service) .

How to Use This Section

This section provides the following information

  1. General diagnosis information on transmissions
  2. Procedures for diagnosing the Hydra-matic transmission

When you diagnose any condition of the Hydra-matic transmission, begin with A Diagnostic Starting Point. This procedure indicates the proper path of diagnosing the transmission by describing the basic checks. This procedure will then refer you to the locations of specific checks. After you have determined the cause of a condition, refer to appropriate repair instructions for repair procedures. If the faulty component is not serviceable without removing the transmission from the vehicle, refer to appropriate unit repair for repair information.

Basic Knowledge

Note. Do not, under any circumstances, attempt to diagnose a powertrain condition without basic knowledge of this powertrain. If you perform diagnostic procedures without this basic knowledge, you may incorrectly diagnose the condition or damage the powertrain components.

You must be familiar with some basic electronics in order to use this section of the service manual. You should also be able to use the following special tools

  1. A digital multimeter (DMM)
  2. A circuit tester
  3. Jumper wires or leads
  4. A line pressure gage set

Diagnosis

Note. If you probe a wire with a sharp instrument and do not properly seal the wire afterward, the wire corrodes and an open circuit results.

Diagnostic test probes are now available that allow you to probe individual wires without leaving the wire open to the environment. These probe devices are inexpensive and easy to install and they permanently seal the wire from corrosion.

Scheme 53

Scheme 53: Transmission Identification Information
Scheme 53: Transmission Identification Information
CalloutComponent Name
1SRTA Tag Location
2Transmission ID Location
3Hydra-Matic 4T65-E ID Tag
4Transmission
5Julian Date
6Shift Built A = First Shift; B = Second Shift; C = Third Shift
7Update Level
8Model
9Serial Number in Base Code 31
10W = Warren Plant
11Hydra-Matic 4T65-E
12Model
13Model Year 6 = 2006
14Line Built 1 = Line 1; 2 = Line 2; 3 = Line 3; 4 = Line 4
15Serial Number
16Julian Date
17Calendar Year 6 = 2006
18Model
19Model Year 6 = 2006
20Hydra-Matic 4T65-E SRTA Tag
21Control Number
22Transmission

Transmission General Description

The 4T65-E is a fully automatic front wheel drive electronically controlled transmission. The 4T65-E provides four forward ranges including overdrive. The PCM/TCM controls shift points by means of two shift solenoids. A vane-type oil pump supplies the oil pressure. The PCM/TCM regulates oil pressure by means of a pressure control solenoid valve.

All vehicles equipped with a 4T65-E transmission have an electronically controlled capacity clutch (ECCC) system. In the ECCC system, the pressure plate does not fully lock to the torque converter cover. It is instead, precisely controlled to maintain a small amount of slippage between the engine and the turbine, reducing driveline torsional disturbances.

You can operate the transmission in any one of the following seven modes

  1. P - Park position prevents the vehicle from rolling either forward or backward. For safety reasons, use the parking brake in addition to the park position.
  2. R - Reverse allows the vehicle to be operated in a rearward direction.
  3. N - Neutral allows the engine to be started and operated while driving the vehicle. If necessary, you may select this position in order to restart the engine with the vehicle moving.
  4. D - Overdrive is used for all normal driving conditions. Overdrive provides four gear ratios plus a converter clutch operation. Depress the accelerator in order to downshift for safe passing.
  5. 3 - Drive position is used for city traffic and hilly terrain. Drive provides three gear ranges and drive range prevents the transmission from operating in fourth gear. Depress the accelerator in order to downshift.
  6. 2 - Manual Second provides two gear ratios under most operating conditions. Manual Second provides acceleration and engine braking. Select this range at any vehicle speed, but the transmission will not downshift into Second gear until the vehicle speed drops below approximately 100 km/h (62 mph)
  7. 1 - Manual Lo provides maximum engine braking. You may also select this range at any vehicle speed, but the transmission will not downshift into First gear until the vehicle speed drops below approximately 60 km/h (37 mph).

Transmission Component and System Description

The mechanical components of this unit are as follows

  1. A torque converter with an electronically controlled capacity clutch (ECCC) This transmission is equipped with an ECCC. The pressure plate does not fully lock to the torque converter cover. Instead, the pressure plate maintains a small amount of slippage, about 20 RPM, in SECOND, THIRD and FOURTH gears, depending on the vehicle application. ECCC was developed to reduce the possibility of noise, vibration or chuggle caused by torque converter clutch (TCC) apply. Typical apply speeds are 49-52 km/h (30-32 mph) in THIRD gear and 65-73 km/h (40-45 mph) in FOURTH gear. Full lockup is available at highway speeds on some applications.
  2. A drive link assembly
  3. 4 multiple disk clutch assemblies: Input, Second, Third and Fourth
  4. 3 friction bands: Forward band, 2/1 band and Reverse band
  5. 2 planetary gear sets: Input and Reaction
  6. 3 one-way clutches: a roller clutch (1-2 support) and 2 sprag clutches (Third and Input)
  7. A final drive and differential assembly
  8. A control valve assembly
  9. A vane type oil pump

The electrical components of this unit are as follows

  1. 2 shift solenoid valves
  2. A torque converter clutch pulse width modulation (TCC PWM) solenoid valve
  3. A pressure control (PC) solenoid valve
  4. An automatic transmission fluid temperature (TFT) sensor
  5. 2 speed sensors: input shaft and vehicle speed sensors
  6. An automatic transmission fluid pressure (TFP) manual valve position switch
  7. Either an internal mode switch (IMS) or an externally-mounted transmission range (TR) switch.
  8. An automatic transmission (A/T) wiring harness assembly

For more information, refer to Electronic Component Description .

Transmission Adaptive Functions

The 4T65-E transmission uses a line pressure control system, that has the ability to adapt line pressure to compensate for normal wear of the following parts

  1. The clutch fiber plates
  2. The springs and seals
  3. The apply bands

The PCM/TCM maintains information for the following transmission adaptive systems

Upshift Adapts (1-2, 2-3 and 3-4)

The PCM/TCM monitors the automatic transmission input speed sensor (ISS) and the vehicle speed sensor (VSS) in order to determine when an upshift has started and completed. The PCM/TCM measures the time for the upshift. If the upshift time is longer than a calibrated value, then the PCM/TCM will adjust the current to the pressure control (PC) solenoid valve to increase the line pressure for the next shift in the same torque range. If the upshift time is shorter than the calibrated value, then the PCM/TCM will decrease the line pressure for the next shift in the same torque range.

Steady State Adapts

The PCM/TCM monitors the ISS sensor and the VSS after an upshift in order to determine the amount of clutch slippage. If excessive slippage is detected, then the PCM/TCM will adjust the current to the PC solenoid valve in order to increase the line pressure to maintain the proper gear ratio for the commanded gear.

The TAP information is divided into 13 units, called cells. The cells are numbered 4 through 16. Each cell represents a given torque range. TAP cell 4 is the lowest adaptable torque range and TAP cell 16 is the highest adaptable torque range. It is normal for TAP cell values to display zero or negative numbers. This indicates that the PCM/TCM has adjusted line pressure at or below the calibrated base pressure.

Clearing Transmission Adaptive Pressure (TAP) or Reset Transmission Adapts

Updating TAP information is a learning function of the PCM/TCM designed to maintain acceptable shift times. It is not recommended that TAP information be reset unless one of the following repairs has been made

  1. Transmission overhaul or replacement
  2. Repair or replacement of an apply or release component - clutch, band, piston, servo
  3. Repair or replacement of a component or assembly which directly affects line pressure

Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, the PCM will need to relearn TAP values. Transmission performance may be affected as new TAPs are learned. The PCM must also relearn TAP values when the PCM or the transmission is replaced.

Scheme 54

Scheme 54: Transmission Control Module
Scheme 54: Transmission Control Module

The transmission control module (TCM) is mounted in the engine compartment and connects directly to the engine wiring harness. A single 49-way connector is used to make the connection between the vehicle wiring and the TCM. The TCM is an electronic control module that receives input or provides output in order to control the operation of the 4T65-E automatic transmission.

The TCM receives the following inputs from the engine control module (ECM)

  1. Engine speed and torque values
  2. Engine intake air temperature (IAT), accelerator pedal position (APP) information
  3. Engine coolant temperature (ECT)
  4. Kick-down request
  5. Traction control status
  6. Driver selected shift mode
  7. Air-conditioning (A/C) status
  8. Cruise control status

The ECM provides this data to the TCM through the controller area network (CAN). The CAN is a 2-wire communication connection between the 2 controllers.

Other TCM inputs are the following

  1. Battery and ignition voltage
  2. Brake switch status
  3. Transmission internal mode switch (IMS) assembly
  4. Transmission fluid temperature (TFT)
  5. Transmission input speed sensor (ISS)
  6. Vehicle speed sensor (VSS)

The TCM provides the following outputs in order to control the automatic transmission

  1. Shift solenoids to control transmission shifting
  2. TCC PWM solenoid operation to control the apply and release of the torque converter clutch
  3. Pressure control (PC) solenoid to regulate transmission line pressure

Other TCM outputs provided to the ECM are the following

  1. MIL illumination request
  2. Vehicle speed
  3. Transmission input speed
  4. Transmission fluid temperature
  5. Commanded gear status
  6. TCC status
  7. Torque reduction requests
  8. IMS status
  9. Transmission service status

Scheme 55

Scheme 55: Vehicle Speed Sensor
Scheme 55: Vehicle Speed Sensor

The vehicle speed sensor (VSS) is a magnetic inductive pickup that relays vehicle speed information to the PCM/TCM. The PCM/TCM uses this information in order to control shift timing, line pressure and TCC apply and release.

The VSS mounts in the case extension at the vehicle speed sensor reluctor wheel, which is pressed onto the final drive carrier assembly. An air gap of 0.27-1.57 mm (0.011-0.062 in) occurs between the sensor and the teeth on the vehicle speed sensor reluctor wheel as the final drive carrier assembly rotates.

The sensor consists of a permanent magnet surrounded by a coil of wire. As the vehicle speed sensor reluctor wheel on the final drive carrier assembly rotates, an AC signal is produced by the VSS. This AC signal consists of a voltage and frequency that changes based on vehicle speed. The PCM/TCM uses the frequency portion of this signal to determine vehicle speed. Higher vehicle speeds induce a higher frequency and a higher voltage measurement at the sensor. The voltage portion of the signal is used in diagnostic procedures.

Sensor resistance should measure between 1,650-2,200 ohms at 20°C (68°F). Output voltage will vary with vehicle speed from a minimum of 0.5 volts AC at 100 RPM to 200 volts at 6,000 RPM.

Scheme 56

Scheme 56: Automatic Transmission Input Speed Sensor
Scheme 56: Automatic Transmission Input Speed Sensor

The automatic transmission input speed sensor (ISS) is a magnetic inductive pickup that relays turbine shaft speed information to the PCM/TCM. The PCM/TCM uses ISS information in order to control line pressure, transmission shift patterns and TCC apply and release. This information is also used in order to calculate the appropriate operating gear ratios and TCC slippage.

The ISS mounts in the case cover, next to the automatic transmission input speed sensor reluctor wheel assembly. An air gap of 0.08-2.12 mm (0.0032-0.0834 in) occurs between the sensor and the teeth on the speed sensor reluctor wheel as the drive sprocket rotates. The speed sensor reluctor wheel is secured to and turns with the drive sprocket by the tangs on the drive sprocket forward thrust washer.

The sensor consists of a permanent magnet surrounded by a coil of wire. As the turbine shaft rotates the speed sensor reluctor wheel and the drive sprocket, an AC signal is produced by the ISS. This AC signal consists of a voltage and frequency that changes based on vehicle speed. The PCM/TCM uses the frequency portion of this signal to determine input shaft speed. Higher input shaft speeds induce a higher frequency and a higher voltage measurement at the sensor. The voltage portion of the signal is used in diagnostic procedures.

Sensor resistance should measure between 820-1020 ohms at 20°C (68°F). Output voltage will vary with the vehicle speed from a minimum of 0.5 volts AC at 300 RPM to 200 volts at 6,000 RPM.

Scheme 57

Scheme 57: 1-2 and 2-3 Shift Solenoid Valves
Scheme 57: 1-2 and 2-3 Shift Solenoid Valves

The shift solenoid valves are two identical, normally open, electronic exhaust valves that control upshifts and downshifts in all forward gear ranges. These shift solenoid valves work together in a combination of ON and OFF sequences in order to control the positions of the 1-2 and 2-3 shift valve trains. The PCM/TCM monitors numerous inputs in order to determine the appropriate solenoid state combination and the transmission gear for the vehicle operating conditions.

Gear1-2 Shift Solenoid Valve2-3 Shift Solenoid Valve
Park, Reverse, NeutralONON
FirstONON
SecondOFFON
ThirdOFFOFF
FourthONOFF

Electronic Component Description

The PCM/TCM energizes the shift solenoids by providing a ground to the solenoid's electrical circuit. This sends a current through the coil winding of the solenoid, thereby creating a magnetic field. The magnetic field repels the plunger inside the solenoid. This seats the solenoid metering ball against the fluid inlet port. This action prevents the exhaust of fluid through the solenoid and provides an increase in fluid pressure at the end of the shift valves. This fluid pressure initiates an upshift by moving the shift valves. See the oil flow diagrams for a complete description of the hydraulic control of the shift valves for each gear range.

Shift solenoid resistance should measure between 19-24 ohms when measured at 20°C (68°F) and between 24-31 ohms when measured at 88°C (190°F).

The shift solenoid valves should energize when the voltage is greater than 7.5 volts. The shift solenoid valves should de-energize when the voltage is less than one volt.

Scheme 58

Scheme 58: Pressure Control Solenoid Valve
Scheme 58: Pressure Control Solenoid Valve

The pressure control (PC) solenoid valve is a precision electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. As current flow is increased, the magnetic field which is produced by the coil moves the solenoid's plunger further away from the exhaust port. Opening the exhaust port decreases the output fluid pressure, which is regulated by the PC solenoid valve. This ultimately decreases line pressure. The PCM/TCM controls the PC solenoid valve based upon various inputs including throttle position, fluid temperature, MAP sensor and gear state.

The PCM/TCM controls the PC solenoid valve on a positive duty cycle at a fixed frequency of 585 Hz (cycles per second). Duty cycle is defined as the percentage of time when current flows through the solenoid coil during each cycle. A higher duty cycle provides a greater current flow through the solenoid. The high (positive) side of the PC solenoid valve electrical circuit at the PCM/TCM controls the PC solenoid valve operation. The PCM/TCM provides a ground path for the circuit, monitors average current and continuously varies the PC solenoid valve duty cycle in order to maintain the correct average current flowing through the PC solenoid valve.

Duty CycleCurrentLine Pressure
+5%0.02 ampsMaximum
+90%1.1 ampsMinimum

Electronic Component Description

The PC solenoid valve resistance should measure between 3-5 ohms when measured at 20°C (68°F).

Scheme 59

Scheme 59: Torque Converter Clutch Pulse Width Modulation Solenoid Valve
Scheme 59: Torque Converter Clutch Pulse Width Modulation Solenoid Valve

The TCC PWM solenoid valve is a normally closed (hydraulically), pulse width modulation (PWM) solenoid which is used to control the apply and release of the converter clutch. The PCM/TCM operates the solenoid with a negative duty cycle at a fixed frequency of 32 Hz in order to control the rate of TCC apply/release. The solenoid's ability to ramp the TCC apply and release pressures results in smoother TCC operation.

When the vehicle's operating conditions are appropriate to apply the TCC, the PCM/TCM immediately increases the duty cycle to approximately 22 percent. The PCM/TCM then ramps the duty cycle up to a maximum of 98 percent in order to achieve full TCC apply pressure. The rate at which the PCM/TCM increases the duty cycle controls the TCC apply. Similarly, the PCM/TCM also ramps down the TCC solenoid duty cycle in order to control TCC release.

Some operating conditions prevent or enable TCC apply under various conditions. Refer to Automatic Transmission Fluid Temperature Sensor . Also, if the PCM/TCM receives a zero voltage signal from the TCC brake switch, signaling that the brake pedal has been depressed, the PCM/TCM immediately releases the TCC.

TCC duty cycle for ECCC equipped vehicles is 22 percent for minimum apply pressure and 43 percent for maximum apply pressure. The TCC PWM solenoid valve will typically be 40-60 percent at full apply. Your results may vary.

The TCC PWM solenoid valve resistance should measure 10-12 ohms when measured at 20°C (68°F) and 13-15 ohms when measured at 88°C (190°F).

Scheme 60

Scheme 60: Automatic Transmission Fluid Pressure Manual Valve Position Switch
Scheme 60: Automatic Transmission Fluid Pressure Manual Valve Position Switch

The automatic transmission fluid pressure (TFP) switch is attached to the valve body and consists of one fluid pressure switch that monitors TCC release pressure. This switch is used as a diagnostic tool to confirm that the TCC is actually OFF when it has been commanded OFF by the PCM/TCM.

The TCC release switch is a normally-closed pressure switch. A normally-closed switch allows current to flow from the positive contact through the switch to ground when no fluid is present. Fluid pressure moves the diaphragm to disconnect the positive and ground contacts, opening the switch and stopping current flow. This change in switch status electronically signals the PCM/TCM that the TCC is released.

Scheme 61

Scheme 61: Lever Assembly-Manual Shaft Detent with Internal Mode Switch
Scheme 61: Lever Assembly-Manual Shaft Detent with Internal Mode Switch

The lever assembly-manual shaft detent with internal mode switch (IMS) is a sliding contact electrical switch assembly that corresponds to the PRNDL position selected. Each of the PRNDL positions has a unique ground pattern on four wires from the PCM/TCM.

The assembly consists of two major components

  1. The internal mode switch that consists of: The housing (1), which makes up the stationary contacts. The insulator (2), which makes up the moving contacts and is secured on the detent lever (4).
  2. The lever assembly which consists of: The manual shaft (3) The detent lever (4)

The range detection is accomplished by securing the moving contacts to the detent lever. When the driver selects a PRNDL position, the detent lever inside the transmission rotates. This rotates the insulator which in turn grounds the four wires in a unique pattern for each gear selection, corresponding to the PRNDL position selected. The IMS is electrically connected by five wires (four of which the PCM/TCM supplies voltage to and one wire that is a common ground) to the transmission pass through connector.

Scheme 62

Scheme 62: Automatic Transmission Fluid Temperature Sensor
Scheme 62: Automatic Transmission Fluid Temperature Sensor

The automatic transmission fluid temperature (TFT) sensor is a negative temperature coefficient thermistor (temperature sensitive resistor) that provides information to the PCM/TCM regarding the transmission fluid temperature. The TFT sensor clips on to the valve body and is replaced as a separate component and not as a part of the AT wiring harness assembly. The TFT sensor monitors non-pressurized fluid in the sump in order to determine the operating temperature of the transmission fluid.

The internal electrical resistance of the sensor varies in relation to the operating temperature of the transmission fluid. The PCM/TCM sends a 5 volt reference signal to the TFT sensor and the PCM/TCM measures the voltage drop in the electrical circuit. A lower fluid temperature creates a higher resistance in the TFT sensor, which produces a higher voltage signal.

The PCM/TCM uses this input in order to help determine the proper line pressure, shift schedules and TCC apply. When the transmission fluid temperature reaches 130°C (266°F), the PCM/TCM enters Hot Mode. Above this temperature the PCM/TCM modifies the transmission shift schedules and the TCC apply in an attempt to reduce the fluid temperature by reducing the transmission heat generation. During Hot Mode the PCM/TCM applies the TCC at all times in third and fourth gears. Also, the PCM/TCM performs the 2-3 and the 3-4 shifts earlier in order to help reduce fluid heat generation.

The PCM/TCM stays in Hot Mode until the temperature drops below 120°C (248°F).

Scheme 63

Scheme 63: Automatic Transmission Inline 20-Way Connector Description
Scheme 63: Automatic Transmission Inline 20-Way Connector Description

The transmission electrical connector is an important part of the transmission operating system. Any interference with the electrical connection can cause the transmission to set Diagnostic Trouble Codes (DTCs) or affect proper operation.

The following items can affect the electrical connection

  1. Bent pins in the connector from rough handling during connection and disconnection
  2. Wires that are within either the internal or external wiring harness which back away from the pins or become uncrimped
  3. Dirt contamination entering the connector when disconnected
  4. Pins in the internal wiring connector backing out of the connector or pushed out of the connector during reconnection
  5. Excessive transmission fluid leaking into the connector, wicking up into the external wiring harness and degrading the wire insulation
  6. Moisture intrusion in the connector
  7. Low pin retention in the external connector from excessive connection and disconnection of the wiring connector assembly
  8. Pin corrosion from contamination
  9. Damaged connector assembly

Remember the following points

  1. In order to remove the connector, squeeze the two tabs toward each other and pull straight up without pulling by the wires.
  2. Limit twisting or wiggling the connector during removal. Bent pins can occur.
  3. Do not pry the connector off with a screwdriver or other tool.
  4. Visually inspect the seals to ensure that they are not damaged during handling.
  5. In order to reinstall the external wiring connector, first orient the pins by lining up the arrows on each half of the connector. Push the connector straight down into the transmission without twisting or angling the mating parts.
  6. The connector should click into place with a positive feel and/or noise.
  7. Whenever the transmission external wiring connector is disconnected from the internal harness and the engine is operating, DTCs will set. Clear these DTCs after reconnecting the external connector.

Special Tools

Special Tools Illustration Tool Number/Description J 6125-B Slide Hammer J 21867 Pressure Gage J 23129 Universal Seal Remover J 29130 Axle Shaft Seal Installer J 34094-A Thermo Element Height Gage J 34115 Sprocket Bearing Installer J 35138 Converter End Play Checker J 35616 GM-Approved Terminal Test Kit J 35944-A Transmission Oil Cooler and Line Flusher J 35944-22 Transmission Oil Cooler Flushing Fluid J 36850 Transjel Lubricant J 36850 TransJel J 37096 Flywheel Holder J 37292-B Axle Seal Protector J 39200 Digital Multimeter J 42562 Axle Removal Wedge J 44152 Jumper Harness (20 pins) J 44246 Solenoid Testing Kit J 45096 Transmission Oil Cooling System Flush and Flow Test Tool J 45681 Jumper Harness

Scheme 64

Scheme 64: Special Tools
Scheme 64: Special Tools

Scheme 65

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Scheme 66

Scheme 66
Scheme 66

Scheme 67

Scheme 67
Scheme 67

Scheme 68

Scheme 68
Scheme 68

Scheme 69

Scheme 69
Scheme 69

Scheme 70

Scheme 70
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Scheme 71

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Scheme 71

See also:
• DTC P0218 (3.6L)
• DTC P0716 (3.8L)
• DTC P0751 (3.6L)
• DTC P1823 (3.6L)
• Fastener Tightening Specifications
• Battery Negative Cable Disconnect/Connect Procedure (L26)
• Air Cleaner Assembly Replacement
• Transmission Control Module Programming and Setup
• Fastener Tightening Specifications
• Air Cleaner Assembly Replacement
• Powertrain Control Module (PCM) Replacement
• Automatic Transaxle Range Selector Cable Caution
• Console Replacement - Front Floor
• Carpet Replacement - Front
• Lifting and Jacking the Vehicle
• Catalytic Converter Replacement
• FASTENER NOTICE
• Transmission Overfill Notice
• Tire and Wheel Removal and Installation
• Engine Support Fixture
• Engine Support Fixture
• Power Steering Gear Replacement
• Frame Replacement
• Stabilizer Shaft Link Replacement
• Wheel Drive Shaft Replacement
• Transmission Fluid Checking Procedure
• Fluid and Lubricant Recommendations
• Capacities - Approximate Fluid
• Fluid Leak Diagnosis
• Draining and Filling Cooling System (L26 Static Fill)
• Engine Mount Inspection
• Splash Shield Replacement - Engine
• Automatic Transmission Oil Cooler Flushing and Flow Test (J35944-A)
• Transmission Fluid Temperature (TFT) Sensor Specifications
• Automatic Transmission Range Selector Cable Adjustment
• Park Lock Cable Adjustment
• Transmission Mount Replacement - Left
• Special Tools
• Fluid Capacity Specifications

More articles — Transmission