Home/Buick/Encore/Buick Encore I (2012-2016)/Repair manual/Automatic Trans/Automatic Transmission - 6t40(mh8 Mhb) - Specifications
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Automatic Transmission - 6t40(mh8 Mhb) - Specifications Buick Encore I

Automatic Trans 19 illustrations ~662 words

Fastener Tightening Specifications (On Vehicle)

ApplicationSpecification
MetricEnglish
A/Trans Control Bolt980 lb in
Control Solenoid Valve Assembly (With TCM and Body) to Case Bolt - M5 x 40.5762 lb in
Control Solenoid Valve Assembly (With TCM and Body) to Case Bolt - M6 x 9712106 lb in
Control Valve Body to Case Bolt1197 lb in
Control Valve Body Cover Bolt12106 lb in
Drain Plug12106 lb in
Fluid Level Hole Plug12106 lb in
Fluid Pressure Test Hole Plug12106 lb in
Input Speed Sensor Bolt980 lb in
Left Transmission Mount to Transmission Bolt50 Plus 60-75 degrees37 lb ft Plus 60-75 degrees
Manual Shift Detent Spring12106 lb in
Output Speed Sensor Bolt980 lb in
Rear Transmission Mount Bracket to Transmission Bolt - FWD100 Plus 30-45 degrees74 lb ft Plus 30-45 degrees
Rear Transmission Mount Through Bolt80 Plus 45-60 degrees59 lb ft Plus 45-60 degrees
Torque Converter to Flywheel Bolt6045 lb ft
Transmission Bracket to Transmission Bolt (1) - AWD100 Plus 30-40 degrees74 lb ft Plus 30-40 degrees
Transmission Bracket to Transmission Bolt (2) - AWD60 Plus 60-75 degrees44 lb ft Plus 60-75 degrees
Transmission Fluid Auxiliary Cooler Bolt (1)871 lb in
Transmission Fluid Auxiliary Cooler Bolt (2)653 lb in
Transmission Fluid Cooler Outlet Pipe Nut2217 lb ft
Transmission Fluid Cooler Pipe Inlet Nut2217 lb ft
Transmission Mount to Body Bolt5843 lb ft
Transmission Mount to Body Nut5843 lb ft
Transmission Nut (1) - 1.6L and 1.8L Engine4030 lb ft
Transmission Bolt (2, 3, 4) - 1.6L and 1.8L Engine6044 lb ft
Transmission Bolt (5) - 1.6L and 1.8L Engine4030 lb ft
Transmission Range Selector Cable Bracket Bolt2216 lb ft
Transmission Range Selector Lever Nut3022 lb ft
Transmission Rear Mount to Frame Bolt100 Plus 90-105 degrees74 lb ft Plus 90-105 degrees

Fastener Tightening Specifications (On Vehicle)

Fastener Tightening Specifications (Off Vehicle)

ApplicationRef No.*QuantitySizeSpecification
MetricEnglish
A/Trans Auxiliary Fluid Pump Outlet Bolt (Hybrid Models)350422 N.m16 lb ft
A/Trans Auxiliary Fluid Pump Bolt (Hybrid Models)355122 N.m16 lb ft
A/Trans Auxiliary Fluid Pump (Pump to Motor) Bolt (Hybrid Models)370410-12 N.m89-106 lb in
A/Trans Fluid Pump Bolt to Converter Housing
First Pass2007 - 6T30, 8 - 6T40/45/50M8x3310 N.m89 lb in
Final Pass200M8x3345°
A/Trans Fluid Pump Cover Bolt3023 - 6T30, 23 - 6T40/45/50M6x2512 N.m106 lb in
A/Trans Fluid Pump Cover Bolt32020 - 6T30M6x21.512 N.m106 lb in
Control Solenoid Valve Assembly (w/TCM and Body) to Case Bolt412M6x9710 N.m89 lb in
Control Solenoid Valve Assembly (w/TCM and Body) to Case Bolt63M5x40.57 N.m62 lb in
Control Valve Body Assembly (Complete) Bolt4001M5x40.57 N.m62 lb in
Control Valve Body to Case Bolt92M6x5311 N.m97 lb in
Control Valve Body to Case Bolt109M6x6011 N.m97 lb in
Control Valve Body Cover Bolt113M6x3012 N.m106 lb in
Drain Plug6411/8"-27 NPTF12 N.m106 lb in
Fluid Level Hole Plug6311/8"-27 NPTF12 N.m106 lb in
Fluid Pressure Test Hole Plug5111/8"-27 NPTF12 N.m106 lb in
Front Differential Carrier Baffle Bolt - Converter Housing2042M6x2512 N.m106 lb in
Front Differential Carrier Baffle Bolt - Case612M6x18.5 - 6T30, M6x16 - 6T40/45/5012 N.m106 lb in
Input Shaft Support Bolt573M6x5012 N.m106 lb in
Input Speed Sensor Bolt211M6x239 N.m80 lb in
Manual Shift Detent Spring171M6x1612 N.m106 lb in
Output Speed Sensor Bolt151M6x189 N.m80 lb in
Torque Converter and Differential Housing Bolt
First Pass2714 - 6T30, 15 - 6T40/45/50M8x3010 N.m89 lb in
Final Pass27M8x3050°
*Reference number refers to the component callout number in Disassembled Views

Fastener Tightening Specifications (Off Vehicle)

Transmission General Specifications(6T40)

Name6T40/6T45/6T50
RPO CodesMH8, MH7, MHK, MHH, MHC, MHJ, MNH, MHB
Production LocationKorea/China/Mexico/Toledo
Transmission DriveFront Wheel Drive
Reverse Gear Ratio2.94
1st Gear Ratio4.584
2nd Gear Ratio2.964
3rd Gear Ratio1.912
4th Gear Ratio1.446
5th Gear Ratio1.000
6th Gear Ratio0.746
Effective Final Drive Gear Ratio2.64/2.89/3.23/3.53/3.87
Torque Converter Size- Diameter of Torque Converter Turbine236 mm
Pressure Taps LinePressure
Transmission Fluid TypeDEXRON VI®
Transmission Fluid Capacity8.0 L/8.5 Quarts
Transmission Type: 6Six Forward Gears
Transmission Type: TTransverse Mount
Transmission Type: 40/45/50Product Series
Position QuadrantP, R, N, D, * *(Refer to the applicable owner's manual)
Case MaterialDie Cast Aluminum
Transmission Net Weight81/86 kg (178/190 lbs)
Maximum Trailer Towing CapacityN/A
Maximum Gross Vehicle Weight (GVW)6T40 - 2000 kg (4,409 lbs) 6T45 - 2200 kg (4,850 lbs) 6T50 - 2500 kg (5,511 lbs)

Transmission General Specifications(6T40)

Adhesives, Fluids, Lubricants, and Sealers

ApplicationType of MaterialGM Part Number
United StatesCanada
Automatic Transmission FluidDEXRON®VI8886103719264717

Adhesives, Fluids, Lubricants, and Sealers

Fluid Capacity Specifications (6T40)

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 Capacity8.0-8.5 liters8.5-9.0 quarts

Fluid Capacity Specifications (6T40)

Fluid Pump Selective Specifications

Fluid Pump Body Pocket DepthFluid Pump Gear Thickness
MetricEnglishMetricEnglish
12.617-12.625 mm0.4967-0.4970 in12.580-12.588 mm0.4952-0.4955 in
12.626-12.636 mm0.4970-0.4974 in12.589-12.599 mm0.4956-0.4960 in
12.637-12.645 mm0.4975-0.4978 in12.600-12.608 mm0.4960-0.4963 in

Fluid Pump Selective Specifications

Range Reference

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 (OWL)HoldingHolding
* = Applied with NO load

Range Reference

Shift Solenoid Valve State and Gear Ratio

GearShift SOL 11-2-3-4 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 6T30Gear Ratio 6T40/45/50
ParkONOFFOFFOFFON
ReverseONOFFOFFONON2.872.940
NeutralONOFFOFFOFFON
1st BrakingONONOFFOFFON4.4494.584
1stOFFONOFFOFFOFF4.4494.584
2ndOFFONONOFFOFF2.9082.964
3rdOFFONOFFONOFF1.8931.912
4thOFFONOFFOFFON1.4461.446
5thOFFOFFOFFONON1.0001.000
6thOFFOFFONOFFON0.7420.746
For shift solenoid 1, "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

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 4/MLOWLOWLOWLOW
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 (Gen 2)

Requested Pressure (kPa)Actual Pressure
MetricEnglish
None172-379 kPa25-55 psi
200662-869 kPa96-126 psi
4001145-1351 kPa166-196 psi
6001634-1841 kPa237-267 psi
8002117-2324 kPa307-337 psi
10002117-2324 kPa307-337 psi
12002117-2324 kPa307-337 psi
14002117-2324 kPa307-337 psi
16002117-2324 kPa307-337 psi
18002117-2324 kPa307-337 psi

Line PC Solenoid Valve Pressure

Scheme 19

Scheme 19: A/Trans Seal Kit (Gen 1& 2) 24251028

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
203A/Trans Input Speed Sensor Assembly O-Ring Seal

A/Trans Seal Kit (Gen 1& 2) 24251028

Scheme 20

Scheme 20: Front Wheel Seal Kit (Gen 1& 2) 19258415

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
2091Front Wheel Drive Shaft Oil Seal Assembly

Front Wheel Seal Kit (Gen 1& 2) 19258415

Scheme 21

Scheme 21: Front Wheel Seal Kit (Gen 1& 2) 19258416

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
651Drive Shaft Oil Seal Assembly

Front Wheel Seal Kit (Gen 1& 2) 19258416

Scheme 22

Scheme 22: A/Trans Seal Kit (Gen 1) 24251353 (1 of 2)
CalloutQuantityComponent Name
31Control Valve Body Cover Gasket
241Torque Converter Housing Gasket
5843-5-Reverse and 4-5-6 Clutch Fluid Seal Ring
651Drive Shaft Oil Seal Assembly
2021Torque Converter and Differential Housing Seal
2091Front Wheel Drive Shaft Oil Seal Assembly
3011Torque Converter Fluid Seal Assembly
3191Torque Converter Fluid Seal Assembly
50413-5-Reverse Clutch Piston Inner Seal
50513-5-Reverse Clutch Piston Inner Seal
50613-5-Reverse Clutch Piston Dam Seal
51814-5-6 Clutch Piston Outer Seal
51914-5-6 Clutch Piston Outer Seal
52114-5-6 Clutch Piston Inner Seal

A/Trans Seal Kit (Gen 1) 24251353 (1 of 2)

Scheme 23

Scheme 23: A/Trans Seal Kit (Gen 1) 24251353 (2 of 2)

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 Hole Seal
81Control Valve Body Filter Plate Assembly
121Control Valve Body Spacer Plate Assembly
141A/Trans Fluid Level Control Valve Gasket
203A/Trans Input Speed Sensor Assembly O-Ring Seal
251A/Trans Fluid Pump Seal Assembly
591Drive Link Lube Fluid Seal
6711-2-3-4 and Low Reverse Clutch Fluid Passage Seal
2031A/Trans Fluid Filter Assembly
4031Channel Plate to Valve Body Spacer Plate Assembly
6041Manual Shift Shaft Seal
6051Park Pawl Actuator Guide Seal

A/Trans Seal Kit (Gen 1) 24251353 (2 of 2)

Scheme 24

Scheme 24: A/Trans Seal Kit (Gen 2) 24260603 (1 of 2)
CalloutQuantityComponent Name
31Control Valve Body Cover Gasket
241Torque Converter Housing Gasket
5833-5-Reverse and 4-5-6 Clutch Fluid Seal Ring
651Drive Shaft Oil Seal Assembly
2021Torque Converter and Differential Housing Seal
2091Front Wheel Drive Shaft Oil Seal Assembly
3011Torque Converter Fluid Seal Assembly
3191Torque Converter Fluid Seal Assembly
50413-5-Reverse Clutch Piston Inner Seal
50513-5-Reverse Clutch Piston Inner Seal
50613-5-Reverse Clutch Piston Dam Seal
51814-5-6 Clutch Piston Outer Seal
51914-5-6 Clutch Piston Outer Seal
52114-5-6 Clutch Piston Inner Seal
52414-5-6 Clutch Piston Fluid Dam Retainer Ring

A/Trans Seal Kit (Gen 2) 24260603 (1 of 2)

Scheme 25

Scheme 25: A/Trans Seal Kit (Gen 2) 24260603 (2 of 2)

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 Hole Seal
81Control Valve Body Filter Plate Assembly
121Control Valve Body Spacer Plate Assembly
141A/Trans Fluid Level Control Valve Gasket
203A/Trans Input Speed Sensor Assembly O-Ring Seal
231Fill Cap Seal
251A/Trans Fluid Pump Seal Assembly
591Drive Link Lube Fluid Seal
6711-2-3-4 and Low Reverse Clutch Fluid Passage Seal
2031A/Trans Fluid Filter Assembly
4031Channel Plate to Valve Body Spacer Plate Assembly
4075Actuator Feed Accumulator Spring
4085Actuator Feed Accumulator Piston
6041Manual Shift Shaft Seal
6051Park Pawl Actuator Guide Seal

A/Trans Seal Kit (Gen 2) 24260603 (2 of 2)

Scheme 26

Scheme 26: Transmission Kit (Gen 1) 24260701

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
52314-5-6 Clutch Piston Fluid Dam Assembly
52414-5-6 Clutch Piston Fluid Dam Retainer Ring
5311Reaction Carrier Hub Assembly

Transmission Kit (Gen 1) 24260701

Scheme 27

Scheme 27: Control Valve Body Kit (Gen 1) 24248473

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
31Control Valve Body Cover Gasket
51Control Valve Body Cover Hole Seal
81Control Valve Body Filter Plate Assembly
121Control Valve Body Spacer Plate Assembly
141A/Trans Fluid Level Control Valve Gasket
6721-2-3-4 and Low Reverse Clutch Fluid Passage Seal
4031Channel Plate to Valve Body Spacer Plate Assembly

Control Valve Body Kit (Gen 1) 24248473

Scheme 28

Scheme 28: Control Valve Body Kit (Gen 2) 24260702

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
31Control Valve Body Cover Gasket
51Control Valve Body Cover Hole Seal
81Control Valve Body Filter Plate Assembly
121Control Valve Body Spacer Plate Assembly
141A/Trans Fluid Level Control Valve Gasket
6721-2-3-4 and Low Reverse Clutch Fluid Passage Seal
4031Channel Plate to Valve Body Spacer Plate Assembly
4075Actuator Feed Accumulator Spring
4085Actuator Feed Accumulator Piston

Control Valve Body Kit (Gen 2) 24260702

Scheme 29

Scheme 29: Clutch Plate Package (Gen 1) 24249460

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
50933-5 Reverse Clutch (w/Friction Material) Plate Assembly
52744-5-6 Clutch (w/Friction Material) Plate Assembly
54222-6 Clutch (w/Friction Material) Plate Assembly
5453Low and Reverse Clutch (w/Friction Material) Plate Assembly
55921-2-3-4 Clutch (w/Friction Material) Plate Assembly

Clutch Plate Package (Gen 1) 24249460

Scheme 30

Scheme 30: Clutch Plate Package (Gen 2) 24260695

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
50933-5 Reverse Clutch (w/Friction Material) Plate Assembly
52754-5-6 Clutch (w/Friction Material) Plate Assembly
54222-6 Clutch (w/Friction Material) Plate Assembly
5453Low and Reverse Clutch (w/Friction Material) Plate Assembly
55921-2-3-4 Clutch (w/Friction Material) Plate Assembly

Clutch Plate Package (Gen 2) 24260695

Scheme 31

Scheme 31: 4-5-6 Plate Assembly (Gen 2) 24260700

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
52754-5-6 Clutch (w/Friction Material) Plate Assembly

4-5-6 Plate Assembly (Gen 2) 24260700

Scheme 32

Scheme 32: Low and Reverse Plate Assembly (Gen 2) 24260696

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
5453Low and Reverse Clutch (w/Friction Material) Plate Assembly

Low and Reverse Plate Assembly (Gen 2) 24260696

Scheme 33

Scheme 33: 3-5 Reverse Plate Assembly (Gen 2) 24260697

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
50933-5 Reverse Clutch (w/Friction Material) Plate Assembly

3-5 Reverse Plate Assembly (Gen 2) 24260697

Scheme 34

Scheme 34: 2-6 Plate Assembly (Gen 2) 24260698

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
54222-6 Clutch (w/Friction Material) Plate Assembly

2-6 Plate Assembly (Gen 2) 24260698

Scheme 35

Scheme 35: 1-2-3-4 Plate Assembly (Gen 2) 24260699

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
55921-2-3-4 Clutch (w/Friction Material) Plate Assembly

1-2-3-4 Plate Assembly (Gen 2) 24260699

Scheme 36

Scheme 36: A/Trans Seal Kit (Gen 2) 24260704

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
3522A/Trans Auxiliary Fluid Pump Outlet Pipe Seal Assembly
3561Pressure Regulator Valve Spring Spacer
3611A/Trans Auxiliary Fluid Pump Gasket
3621A/Trans Auxiliary Fluid Pump Seal
3631A/Trans Auxiliary Fluid Pump Cover Seal
3671A/Trans Auxiliary Fluid Pump Motor Cover Seal- O-Ring
3711A/Trans Auxiliary Fluid Inlet Pump Seal
3731A/Trans Fluid Trough Check Ball

A/Trans Seal Kit (Gen 2) 24260704

Scheme 37

Scheme 37: A/Trans Auxiliary Seal Kit (Gen 2) 24260705

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
3522A/Trans Auxiliary Fluid Pump Outlet Pipe Seal Assembly
3561Pressure Regulator Valve Spring Spacer
3611A/Trans Auxiliary Fluid Pump Gasket
3621A/Trans Auxiliary Fluid Pump Seal
3631A/Trans Auxiliary Fluid Pump Cover Seal
3671A/Trans Auxiliary Fluid Pump Motor Cover Seal- O-Ring

A/Trans Auxiliary Seal Kit (Gen 2) 24260705