Sonnax GM 6T40 (Gen. 2) Transmission

Remanufactured Valve Body

6T30 (Gen. 2), 6T40 (Gen. 2), 6T45 (Gen. 2), 6T50 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40) Remanufactured Valve Body GM6T40-2-3

Internal

3-5-R Drum Saver Kit 144555K

Helps cure:

Code P0776
Flare shifts
Harsh Reverse
No Reverse
2-3 Harsh
No 3rd
4-5 Harsh
No 5th

4-5-6 Clutch Drum Bushing 144030-02

Front Side

Bushing Style: Precision
Material: Steel-backed alloy
Housing Bore: 1.759"
Shaft Dia.: 1.632"
Width: 0.356"

Helps cure:

Bushing wear
Bushing failure

4-5-6 Clutch Drum Bushing 144030-01

Rear Side

Bushing Style: Precision
Material: Steel-backed alloy
Housing Bore: 1.969"
Shaft Dia.: 1.840"
Width: 0.310"

Helps cure:

Bushing wear
Bushing failure

4-5-6 Clutch Hub Bushing 144030-03

Bushing Style: Precision
Material: PTFE-Impregnated Bimetal
Housing Bore: 0.920"
Shaft Dia.: 0.821"
Width: 0.300"

Helps cure:

Bushing wear
Bushing failure

Bearing Kit SBK-G40

Does not fit Gen. 3 units.

Helps cure:

Bearing noise
Bearing failure

Bushing Kit 144030-35K

Helps cure:

Bushing wear
Bushing failure

Drive Sprocket Hub Bushing 144030-08

Bushing Style: Precision
Material: Steel-backed alloy
Housing Bore: 0.887"
Shaft Dia.: 0.790"
Width: 0.385"

Helps cure:

Bushing wear
Bushing failure

Output Planet Sun Gear Bushing 144030-07

Bushing Style: Precision
Material: PTFE-Impregnated Bimetal
Housing Bore: 1.478"
Shaft Dia.: 1.360"
Width: 0.545"

Helps cure:

Bushing wear
Bushing failure

Reaction Sun Gear Bushing 144030-04

Bushing Style: Precision
Material: Steel-backed alloy
Housing Bore: 1.307"
Shaft Dia.: 1.183"
Width: 0.552"

Helps cure:

Bushing wear
Bushing failure

Pump

Oversized TCC Control Valve Kit 144510-05K

Helps cure:

Excess TCC slip
Low cooler flow
Overheating
Low converter & lube flow
TCC apply & release concerns
TCC codes
TCC lining failure

Tooling:

F-144510-TL5C
VB-FIX

Pump Bushing 144030-06

Bushing Style: Precision
Material: PTFE-Impregnated Bimetal
Housing Bore: 1.698"
Shaft Dia.: 1.562"
Width: 0.710"

Helps cure:

Bushing wear
Bushing failure

Stator Support Bushing 144036B

Bushing Style: Precision
Material: Steel-Backed Alloy
Housing Bore: 0.919"
Shaft Dia.: 0.791"
Width: 0.845"

Helps cure:

Spun-out bushings
TCC slip
Code P0741
Code P1744
Premature wear & bushing failure

Valve Body (View Valve Body Layout Diagram)

Actuator Feed Limit Valve Kit 144740-39K

Helps cure:

No 4th
No 5th
No 6th
Low clutch oil pressure
Harsh shifts
Flare shifts

Checkball 10000-08

Material: Imidized Plastic
Dia.: 0.250"

Helps cure:

Lost or damaged component

O-Ringed End Plug Kit 144510-14K

Helps cure:

Pressure loss
Burnt clutches
Shift concerns
TCC apply concerns

Oversized Actuator Feed Limit Valve 144740-01

Helps cure:

No 4th
No 5th
No 6th
Low clutch oil pressure
Harsh shifts
Flare shifts

Tooling:

144740-TL

Oversized TCC Regulator Valve Kit 144740-16K

Helps cure:

Code P0741, P0742
No lockup
TCC slip
Loss of fuel economy
Low TCC apply pressure
Overheated fluid & TCC lining
Harsh TCC apply

Tooling:

F-144740-TL16
VB-FIX

Signal Accumulator Piston Kit 144740-40K

Helps cure:

Shift concerns associated with circuit pressure loss
Burnt clutches
Soft shifts

TCC Regulator Valve Kit 144740-38K

Helps cure:

Code P0741, P0742
No lockup
TCC slip
Loss of fuel economy
Low TCC apply pressure
Overheated fluid & TCC lining
Harsh TCC apply

Zip Kit® 6T40-GEN2-3-ZIP

Helps cure:

Burnt clutches
Line pressure instability
Loss of fuel economy
No line rise
Pressure loss
Shift concerns
TCC apply & release concerns
TCC codes

Case

Axle Bushing 144030-09A

Bushing Style: Precision
Material: PTFE-Impregnated Bimetal
Housing Bore: 1.524"
Shaft Dia.: 1.378"
Width: 0.635"

Helps cure:

Bushing wear
Bushing failure

Case Saver Kit 144281-01K

Helps cure:

Worn bearing housing
Bushing wear
Axle shaft leak
Excess differential/axle backlash
Excess endplay
Difficulty setting endplay

Other

Tool Kit F-144510-TL12C

Tooling:

VB-FIX

Tool Kit F-144510-TL5C

Tooling:

VB-FIX

Tool Kit 144740-TL

Tech Resources

January 30, 2023

Signal Accumulators & Solenoid Dampers: Their Function & Impact on Drivability Complaints

Maura Stafford

January 25, 2023

Uncovering the Root Cause of Pressure & Complaints – The Critical Role of Solenoid Modulator & AFL Valves

Maura Stafford

December 29, 2022

Zip Kit FAQ: What's Up with Plugging Separator Plate Ports?

December 07, 2022

Stop-Start Accumulators: What You Don't Know CAN Hurt You

Matt Allbert

July 01, 2020

Always Identify These Valve Bodies BEFORE You Start a Transmission Rebuild

Andrew Jessiman

January 09, 2020

Остановка отказа GM 6T40 и 6T70 3-5-R с помощью комплектов Sonnax Drum Saver

September 19, 2019

GM 6T40 & 6T70 Drum Saver Kits: Unbeatable Protection Against 3-5-R Failures & Comebacks

September 10, 2019

Protect Against 6T40 & 6T70 3-5-R Failures & Salvage Damaged Drums with Sonnax Drum Saver Kits

August 01, 2017

Transmission Report: Recognize & Repair Solenoid Accumulators in Late-Model Valve Bodies

July 27, 2017

How to Recognize & Repair Solenoid Accumulators in Late-Model Valve Bodies

June 02, 2017

GM 6T30/40/45/50 (Gen. 2), 6T40 (Gen. 3) Valve Body Layout

May 25, 2017

GM 6T30/40/45/50 (Gen. 2), 6T35/31/41/46/51 (Gen. 3 6T40) Vacuum Test Guide

September 18, 2014

GM Gen. 1, 2 & 3 6T30, 6T40, 6T45, 6T50 Series Identification Guide

Related Transmission Units

View 6T30 (Gen. 2) Parts