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Automatic Transmission - 6t70 - Specifications Buick LaCrosse II

Automatic Trans 11 illustrations ~523 words

Fastener Tightening Specifications (Off Vehicle)

Application*Ref No.QuantitySizeSpecification
MetricEnglish
A/Trans Case Cover Bolt1810M6x1.0x3012 N.m106 lb in
A/Trans Fluid Pump Bolt13M6x1.0x2512 N.m106 lb in
A/Trans Fluid Trough Bolt111M6x1.0x2512 N.m106 lb in
Control Valve Body Assembly (Complete) Bolt19, 213M6x1.0x5512 N.m106 lb in
Control Valve Body Assembly (Complete) Bolt203M6x1.0x3512 N.m106 lb in
Control Valve Body Assembly (Complete) Bolt225M6x1.0x6512 N.m106 lb in
Control Valve Body to Case232M6x1.0x5512 N.m106 lb in
Control Valve Body to Case Bolt248M6x1.0x6512 N.m106 lb in
Control Valve Assembly (w/TCM and Body) to Case Bolt251M6x1.0x4212 N.m106 lb in
Control Valve Assembly (w/TCM and Body) to Case Bolt261M6x1.0x5512 N.m106 lb in
Control Valve Assembly (w/TCM and Body) to Case Bolt272M6x1.0x6512 N.m106 lb in
Control Valve Assembly (w/TCM and Body) to Case Bolt284M6x1.0x8012 N.m106 lb in
Control Valve Assembly (w/TCM and Body) to Case Bolt293M6x1.0x9512 N.m106 lb in
Control Valve Body Cover Bolt3012M6x1.0x3012 N.m106 lb in
Control Valve Body Cover Stud312M6x1.0x3012 N.m106 lb in
Fluid Pressure Test Hole Plug1211/8"-27 NPTF12 N.m106 lb in
Fluid Level Hole Plug1311/8"-27 NPTF12 N.m106 lb in
Front Differential Carrier Baffle Bolt61M6x1.0x2512 N.m106 lb in
Front Differential Transfer Drive Gear Support Bolt
First Pass59M8x1.25x2510 N.m89 lb in
Final Pass59M8x1.25x2550 degrees
Input Shaft Support Bolt (Torx)N/A3M6x1.0x5012 N.m106 lb in
Input Speed Sensor Bolt171M6x1.0x259 N.m80 lb in
Output Speed Sensor Bolt141M6x1.0x2512 N.m106 lb in
Park Pawl Actuator Bracket Bolt102M6x1.0x2512 N.m106 lb in
Support Fluid Passage Tube (Torx) Bolt22M5x0.8x127 N.m62 lb in
Support Fluid Passage Tube Bolt32M6x1.0x1512 N.m106 lb in
Torque Converter and Differential Housing Bolt814M8x1.25x3536 N.m27 lb ft
Torque Converter and Differential Housing Bolt93M8x1.25x3530 N.m22 lb ft
Transmission Cooler Pipe (External Torx) Stud152M8x1.25x30.512 N.m106 lb in
*Reference number refers to the component callout number in Disassembled Views

Fastener Tightening Specifications (Off Vehicle)

Fastener Tightening Specifications (On Vehicle)

ApplicationSpecification
MetricEnglish
Control Valve Assembly (with TCM and Body) to Case Bolt - M6x1.0x4212106 lb in
Control Valve Assembly (with TCM and Body) to Case Bolt - M6x1.0x5512106 lb in
Control Valve Assembly (with TCM and Body) to Case Bolt - M6x1.0x6512106 lb in
Control Valve Assembly (with TCM and Body) to Case Bolt - M6x1.0x8012106 lb in
Control Valve Body Assembly Bolt - M6x1.0x3512106 lb in
Control Valve Body Assembly Bolt - M6x1.0x5512106 lb in
Control Valve Body Assembly Bolt - M6x1.0x6512106 lb in
Control Valve Body Cover Bolt - M6x1.0x3012106 lb in
Control Valve Body Cover Bolt - M6x1.0x9512106 lb in
Control Valve Body to Case Bolt - M6x1.0x5512106 lb in
Fluid Cooler Fitting at Radiator3828 lb ft
Fluid Cooler Pipe Nut2216 lb ft
Fluid Level Hole Plug12106 lb in
Fluid Pressure Test Hole Plug12106 lb in
Flywheel Cover Bolt1089 lb in
Input Speed Sensor Bolt980 lb in
Manual Shift Position Switch Screw3.531 lb in
Output Speed Sensor Bolt12106 lb in
Torque Converter to Flywheel Bolt6246 lb ft
Transaxle Front Brace Bolts5037 lb ft
Transaxle Rear Brace Bolts10074 lb ft
Transaxle Range Switch Bolt2015 lb ft
Transaxle Range Switch Lever Nut3526 lb ft
Transaxle Shift Control Nut871 lb in
Transaxle to Engine Bolt7555 lb ft
Transmission Cooler Pipe Stud - External Torx12106 lb in
Transmission Front Mount Through Bolt10074 lb ft
Transmission Front Mount To Transmission Bolts6246 lb ft
Transmission Mount Bolt - Left Side to Body2216 lb ft
Transmission Mount Bolt - Left Side to Transmission50 + 60-75 Degrees37 lb ft + 60-75 Degrees
Transmission Mount Nut - Left Side to Body2216 lb ft
Transmission Rear Mount Through Bolt10577 lb ft
Transmission Rear Mount to Cradle Short Bolts - AWD10074 lb ft
Transmission Rear Mount to Cradle Long Bolt - AWD6246 lb ft
Transmission Rear Mount to Cradle Bolts - FWD100 +120-130 Degrees74 lb ft +120-130 Degrees
Transmission Rear Mount to Transmission Through Bolt10074 lb ft

Fastener Tightening Specifications (On Vehicle)

Transmission General Specifications

Name6T70/6T75
RPO Codes6T70-MH2 (2WD), MH4 (4WD) 6T75-MY9 (2WD), MH6 (4WD)
Production LocationWarren Michigan (USA), Ramos, Mexico
Transaxle DriveFront Wheel Drive, All Wheel Drive
Reverse Gear Ratio2.88
1st Gear Ratio4.484
2nd Gear Ratio2.872
3rd Gear Ratio1.842
4th Gear Ratio1.414
5th Gear Ratio1.000
6th Gear Ratio0.742
Effective Final Drive Gear Ratio2.77/3.16/3.39
Torque Converter Size- Diameter of Torque Converter Turbine246 mm
Pressure TapsLine Pressure
Transaxle Fluid TypeDEXRON VI®
Transaxle Fluid Capacity9.0 L/9.5 qts Quarts
Transaxle Type: 6Six Forward Gears
Transaxle Type: TTransverse Mount
Transaxle Type: 70/75Product Series
Position QuadrantP, R, N, D, * *(Refer to the applicable owner's manual)
Case MaterialDie Cast Aluminum
Transaxle Net Weight104 kg
Maximum Trailer Towing CapacityN/A
Maximum Gross Vehicle Weight (GVW)4, 000 lbs

Transmission General Specifications

Adhesives, Fluids, Lubricants, and Sealers

ApplicationType of MaterialGM Part Number
United StatesCanada
Automatic Transmission FluidDEXRON®VI8886103719264717
Input Speed SensorThreadlock1234538210953489
Torque Converter BoltsThreadlock1234538210953489

Adhesives, Fluids, Lubricants, and Sealers

Fluid Capacity Specifications

ApplicationSpecification
MetricEnglish
Valve Body Cover Removal - Approximate Capacity5.0-7.0 liters5.3-7.4 quarts
Fluid Change - Drain Plug - Approximate Capacity4.0-6.0 liters4.2- 6.3 quarts
Overhaul - Approximate Capacity7.0-9.0 liters7.4-9.5 quarts

Fluid Capacity Specifications

Taper Bearing Preload Selective Specifications

Thrust Washer O.D. Color CodeWasher Thickness
MetricEnglish
Brown0.494 mm0.020 in
Purple0.545 mm0.022 in
Black0.596 mm0.024 in
Pink0.647 mm0.026 in
Dark Blue0.698 mm0.028 in
Light Green0.749 mm0.030 in
Plain0.800 mm0.032 in
White0.851 mm0.034 in
Light Blue0.902 mm0.036 in
Orange0.953 mm0.038 in
White/Black1.004 mm0.040 in
White/Orange1.055 mm0.042 in
White/Light Green1.106 mm0.044 in

Front Differential Drive Pinion Gear and Differential Thrust Washer Selection Chart

Clutch & Band Application

RangeParkReverseNeutralDrive
1st Braking1st2nd3rd4th5th6th
1-2-3-4 ClutchAppliedAppliedAppliedAppliedApplied
3-5 Reverse ClutchAppliedAppliedApplied
4-5-6 ClutchAppliedAppliedApplied
2-6 ClutchAppliedApplied
Low and Reverse ClutchApplied*AppliedApplied*Applied
Low Clutch Assembly (OWC)HoldingHolding
* = Applied with NO load

Range Reference

Shift Solenoid Valve State and Gear Ratio

GearShift SOL 1Shift SOL 21-2-3-4 CL PC SOL 5 N.L.2-6 CL PC SOL 4 N.L.3-5 REV CL PC SOL 2 N.H.LOW REV 4-5-6 CL PC SOL 3 N.H.Gear Ratio
ParkONONOFFOFFOFFON
ReverseONOFFOFFOFFONON2.88
NeutralONONOFFOFFOFFON
1st BrakingONONONOFFOFFON4.484
1stOFFONONOFFOFFOFF4.484
2ndOFFONONONOFFOFF2.872
3rdOFFONONOFFONOFF1.842
4thOFFONONOFFOFFON1.414
5thOFFONOFFOFFONON1.000
6thOFFONOFFONOFFON0.742
Effective Final Drive Ratio - 6T70/75 - 2.77/3.16 For shift solenoids 1 and 2, "ON" = Solenoid Energized (Pressurized) "OFF" = Solenoid De-energized (No Pressure). For pressure control solenoids, "ON" = Pressurized, "OFF" = No Pressure

Shift Solenoid Valve State and Gear Ratio

Shift Speed

Shift @ TPKm/hOSS (RPM)
1-2 @ 12.518400
2-3 @ 12.534755
3-4 @ 12.5461021
4-5 @ 12.5601332
5-6 @ 12.5741643
6-5 @ 12.5691532
5-4 @ 12.5691532
4-3 @ 12.543955
3-2 @ 12.516355
2-1 @ 12.516355
1-2 @ 2536799
2-3 @ 25591310
3-4 @ 25781732
4-5 @ 25942087
5-6 @ 251503331
6-5 @ 25691532
5-4 @ 25521155
4-3 @ 2543955
3-2 @ 2516355
2-1 @ 2516355

Shift Speed

Note. Shift speed points are affected by many different vehicle and transmission operating conditions. The table above represents shift speed points calibrated at specific throttle angles during normal operating conditions and a temperature range between 0-130°C (32-266°F). These shift speed points are also based on an effective final drive ratio of 2.77, and assume a production-intent tire size. The table below illustrates a number of different variables that influence these shift speed points. Based on a given operating condition, these variables may override the normal shift speed points. To assist in monitoring the different variables, the respective scan tool data parameter is also listed.

Scan Tool ParameterShift Speed Variables
Calc. Throttle PositionCalc. Throttle Position (TP) is one of the most important inputs in the transmission shift pattern logic. A very low TP angle will impact the shift pattern by causing upshifts. A very high TP angle will impact the shift pattern by causing downshifts.
Commanded GearBased on numerous inputs, the transmission control module (TCM) selects the optimum gear. Once the TCM commands a gear, the pressure control solenoids are activated to hydraulically control engagement of the proper clutch.
CruiseWhen cruise control is activated, the shift pattern is altered to reduce excessive shifting.
ECTShift speed points may be offset to enhance engine coolant temperature (ECT) warm-up. Also, operating the vehicle at higher engine speeds will reduce the time to warm the ECT and the TFT.
Engine SpeedTo protect against an over speed condition, engine speed is monitored. If the engine speed becomes too high, an upshift will occur.
Engine TorqueEngine torque is used to predict vehicle operating conditions, in order to determine the optimum gear and provide for a smoother ride.
IMSThe internal mode switch (IMS) indicates the position of the transmission manual valve. The operator controls this valve by moving the gear range selector. Therefore, the possible gears may be limited by this valve position.
TCC PC Sol. Duty CycleThe torque converter clutch (TCC) pressure control (PC) solenoid duty cycle indicates when the TCC has been engaged.
TCC Slip SpeedThe TCC Slip Speed indicates the difference between engine speed and transmission input speed. The TCC is locked when slip speed is at or near zero, and may be controlling slip when at lower slip speeds.
TFP Switch 1, 3, 4 or 5The transmission fluid pressure (TFP) switch is used to indicate if fluid pressure to a specific clutch has been applied or released.
Trans. Fluid Temp.A lower TFT will extend shift speeds, a higher TFT, or hot mode condition, will invoke shorter shift speeds in order to establish a shift pattern required to cool the TFT.
Transmission Hot ModeIf the TFT becomes too hot, a hot mode shift pattern is used. The hot mode shift pattern will invoke lower shift speed points to establish a shift pattern necessary to cool the TFT.
Transmission OSSThe transmission output speed sensor (OSS) is one of the most important inputs into the transmission shift pattern logic. A very low transmission output speed will impact the shift pattern by causing downshifts. A very high transmission output speed will impact the shift pattern by causing upshifts.

Shift Speed Variables

Transmission Fluid Pressure Switch Logic

GearTFP Switch States
TFP SW1*TFP SW3TFP SW4TFP SW5
ParkHighLowLowLow
ReverseLowLowLowLow
NeutralHighLowLowLow
Drive 1st - Engine BrakingHighHighLowLow
Drive 1stHighHighLowHigh
Drive 2ndHighLowLowHigh
Drive 3rdLowHighLowHigh
Drive 4thHighHighLowLow
Drive 5thLowHighHighLow
Drive 6thHighLowHighLow
High = 12 V (Switch Open or Pressurized) Low = 0 V (Switch Closed or No Pressure) Note: All TFP switches are normally closed (NC) *TFP switch 2 does not exist

Transmission Fluid Pressure Switch Logic

Transmission Internal Mode Switch Logic

Gear Selector PositionSignal ASignal BSignal CSignal P
ParkLOWHIHILOW
Park/ReverseLOWLOWHILOW
ReverseLOWLOWHIHI
Reverse/NeutralHILOWHIHI
NeutralHILOWHILOW
Neutral/Drive 6HILOWLOWLOW
Drive 6HILOWLOWHI
Drive 6/Drive 4LOWLOWLOWHI
Drive 4LOWLOWLOWLOW
Drive 4/Drive 3LOWHILOWLOW
Drive 3LOWHILOWHI
Drive 3/Drive 2HIHILOWHI
Drive 2HIHILOWLOW
OpenHIHIHIHI
InvalidHIHIHILOW
InvalidLOWHIHIHI
HI = Ignition voltage LOW = 0 volts

Transmission Internal Mode Switch Logic

Solenoid Valve Pressure

Requested Pressure (kPa)Actual Pressure
MetricEnglish
0345-900 kPa50-130 psi
200690-900 kPa100-130 psi
4001100-1310 kPa160-190 psi
6001520-1725 kPa220-250 psi
8001860-2070 kPa270-300 psi
10001860-2070 kPa270-300 psi

Line PC Solenoid Valve Pressure

Scheme 110

Scheme 110: Clutch Plate Pack 24240100
Scheme 110: Clutch Plate Pack 24240100

Note. Callouts with boxes around them indicate part is included in the service kit. Callouts without boxes are shown for relationship purposes only.

CalloutQuantityComponent Name
42543-5-Reverse Clutch (w/Friction Material) Plate Assembly
44064-5-6 Clutch (w/Friction Material) Plate Assembly
44732-6 Clutch (w/Friction Material) Plate Assembly
4514Low and Reverse Clutch (w/Friction Material) Plate Assembly
45621-2-3-4 Clutch (w/Friction Material) Plate Assembly

Clutch Plate Pack 24240100

Scheme 111

Scheme 111: Front Wheel Drive Shaft Seal Kit 19258265
Scheme 111: Front Wheel Drive Shaft Seal Kit 19258265

Note. Callouts with boxes around them indicate part is included in the service kit. Callouts without boxes are shown for relationship purposes only.

CalloutQuantityComponent Name
2261Front Wheel Drive Shaft Oil (RHS)Seal Assembly
X1Seal Protector (Not Shown)

Front Wheel Drive Shaft Seal Kit 19258265

Scheme 112

Scheme 112: Front Wheel Drive Shaft Seal Kit 19258266
Scheme 112: Front Wheel Drive Shaft Seal Kit 19258266

Note. Callouts with boxes around them indicate part is included in the service kit. Callouts without boxes are shown for relationship purposes only.

CalloutQuantityComponent Name
611Front Wheel Drive Shaft Oil Seal Assembly
X1Seal Protector (Not Shown)

Front Wheel Drive Shaft Seal Kit 19258266

Scheme 113

Scheme 113: Control Valve Body Kit 24248118
Scheme 113: Control Valve Body Kit 24248118
CalloutQuantityComponent Name
51Control Valve Body Cover Assembly Gasket
101Control Valve Body Cover Wiring Connector Hole Seal
161Control Solenoid (w/Body and TCM) Filter Plate Assembly
6511-2-3-4 Clutch Fluid Passage Seal
3011Control Valve Channel Upper Plate Assembly
3091Control Valve Upper Body Spacer Plate Assembly
3102Control Valve Upper Body Spacer Plate Retainer
31110Control Valve Body Ball Check Valve
3131Control Valve Lower Body Spacer Plate Assembly

Control Valve Body Kit 24248118

Scheme 114

Scheme 114: Automatic Transmission Service Seal Kit (1 of 2) 24253594
Scheme 114: Automatic Transmission Service Seal Kit (1 of 2) 24253594

Note. Callouts with boxes around them indicate part is included in the service kit. Callouts without boxes are shown for relationship purposes only.

CalloutQuantityComponent Name
221Torque Converter Housing Outer Seal
331A/Trans Case Cover Gasket
581Front Differential Drive Pinion Gear Lube Dam
611Front Wheel Drive Shaft Oil Seal Assembly
2051Front Differential Transfer Drive Gear Support Seal Assembly
2131Front Differential Transfer Drive Gear Support Seal
2191Drive Sprocket Thrust Washer
2201Drive Sprocket Thrust Washer
2241Front Differential Drive Pinion Gear Lube Dam
2251Torque Converter Fluid Seal Assembly
2261Front Wheel Drive Shaft Oil Seal Assembly
40443-5-Reverse and 4-5-6 Clutch Fluid Seal Ring
41913-5-Reverse Clutch Piston Inner Seal
42013-5-Reverse Clutch Piston Inner Seal
42113-5-Reverse Clutch Piston Dam Seal
43014-5-6 Clutch Piston Inner Seal
43114-5-6 Clutch Piston Outer Seal
43214-5-6 Clutch Piston Outer Seal
X2Trans Fluid Cooler Pipe Washer (Not Shown)
X1Axle Seal Protector (Not Shown)

Automatic Transmission Service Seal Kit (1 of 2) 24253594

Scheme 115

Scheme 115: Automatic Transmission Service Seal Kit (2 of 2) 24253594
Scheme 115: Automatic Transmission Service Seal Kit (2 of 2) 24253594
CalloutQuantityComponent Name
41Fluid Level Indicator Tube Seal - Model Dependent
541A/Trans Fluid Trough O-Ring Seal
571A/Trans Pump Fluid Outlet Seal Assembly
2011A/Trans Fluid Filter Assembly
2021Filter Neck Seal
2061Front Differential Transfer Drive Gear Support Torque Converter Fluid Seal Assembly
2121Front Differential Transfer Drive Gear Support Fluid Passage Tube Gasket
4021ISS O-Ring Seal
5081Manual Shift Shaft Seal
5101Manual Shift Shaft Pin

Automatic Transmission Service Seal Kit (2 of 2) 24253594

Scheme 116

Scheme 116: Automatic Transmission Service Seal Kit 24256112
Scheme 116: Automatic Transmission Service Seal Kit 24256112

Note. Callouts with boxes around them indicate part is included in the service kit. Callouts without boxes are shown for relationship purposes only.

CalloutQuantityComponent Name
581Front Differential Drive Pinion Gear Lube Dam
611Front Wheel Drive Shaft Oil Seal Assembly
2241Front Differential Drive Pinion Gear Lube Dam
2261Front Wheel Drive Shaft Oil (RHS) Seal Assembly

Automatic Transmission Service Seal Kit 24256112

Scheme 117

Scheme 117: Control Valve Body Kit 24256111
Scheme 117: Control Valve Body Kit 24256111

Note. Callouts with boxes around them indicate part is included in the service kit. Callouts without boxes are shown for relationship purposes only.

CalloutQuantityComponent Name
51Control Valve Body Cover Assembly Gasket
101Control Valve Body Cover Wiring Connector Hole Seal
161Control Solenoid (w/Body and TCM) Filter Plate Assembly
221Torque Converter Housing Outer Seal
331A/Trans Case Cover Gasket
6511-2-3-4 Clutch Fluid Passage Seal
2011A/Trans Fluid Filter Assembly
3011Control Valve Channel Upper Plate Assembly
3091Control Valve Upper Body Spacer Plate Assembly
3102Control Valve Upper Body Spacer Plate Retainer
31110Control Valve Body Ball Check Valve
3131Control Valve Lower Body Spacer Plate Assembly

Control Valve Body Kit 24256111

Scheme 118

Scheme 118: Automatic Transmission Service Seal Kit 24240103
Scheme 118: Automatic Transmission Service Seal Kit 24240103

Note. Callouts with boxes around them indicate part is included in the service kit. Callouts without boxes are shown for relationship purposes only.

CalloutQuantityComponent Name
2051Front Differential Transfer Drive Gear Support Seal Assembly
2131Front Differential Transfer Drive Gear Support Seal
2141Drive Sprocket Thrust Washer
2191Drive Sprocket Thrust Washer
2201Drive Sprocket Thrust Washer
40443-5-Reverse and 4-5-6 Clutch Fluid Seal Ring
41913-5-Reverse Clutch Piston Inner Seal
42013-5-Reverse Clutch Piston Inner Seal
42113-5-Reverse Clutch Piston Dam Seal
43014-5-6 Clutch Piston Inner Seal
43114-5-6 Clutch Piston Outer Seal
43214-5-6 Clutch Piston Outer Seal
X2Trans Fluid Cooler Pipe Washer (Not Shown)

Automatic Transmission Service Seal Kit 24240103

Scheme 119

Scheme 119: Automatic Transmission Service Seal Kit 2 24240103
Scheme 119: Automatic Transmission Service Seal Kit 2 24240103

Note. Callouts with boxes around them indicate part is included in the service kit. Callouts without boxes are shown for relationship purposes only.

CalloutQuantityComponent Name
41Fluid Level Indicator Tube Seal - Model Dependent
541A/Trans Fluid Trough O-Ring Seal
2121Front Differential Transfer Drive Gear Support Fluid Passage Tube Gasket
4021ISS O-Ring Seal
5081Manual Shift Shaft Seal
5101Manual Shift Shaft Pin

Automatic Transmission Service Seal Kit 2 24240103

Scheme 120

Scheme 120: Automatic Transmission Service Seal Kit 24240106
Scheme 120: Automatic Transmission Service Seal Kit 24240106

Note. Callouts with boxes around them indicate part is included in the service kit. Callouts without boxes are shown for relationship purposes only.

CalloutQuantityComponent Name
571A/Trans Pump Fluid Outlet Seal Assembly
2021Filter Neck Seal
2061Front Differential Transfer Drive Gear Support Torque Converter Fluid Seal Assembly
2251Torque Converter Fluid Seal Assembly
X1Front Wheel Drive Shaft Oil Seal Protector (Not Shown)

Automatic Transmission Service Seal Kit 24240106

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