Sonnax GM 6T80 (Gen. 2) Transmission

Remanufactured Valve Body

6T70 (Gen. 2), 6T75 (Gen. 2), 6T80 (Gen. 2) Remanufactured Valve Body GM6T70-2

Sold without TEHCM.

Valve Body (View Valve Body Layout Diagram)

4-5-6 Accumulator Piston Kit 124740-57K

Helps cure:

3-4 Flare
Ratio codes
4-5-6 Clutch burned
Slipping gears
3-4 Harsh

Actuator Feed Limit Valve Kit 124740-33K

Helps cure:

Wrong gear starts
Clutch failure
Solenoid performance codes

Isolator Valve Kit 124740-03K

Helps cure:

Low line pressure
Line pressure instability
No line rise
Burnt clutches
Harsh shifts
Shift concerns

Isolator Valve Spring 124740-16

Helps cure:

No line rise
Line pressure instability

Jig Plate 124740-JP40

Jig plate for 124740-TL40. Fits Gen. 1 and Gen. 2 units.

O-Ringed End Plug Kit 124740-02K

Helps cure:

Pressure loss
Shift concerns
Burnt clutches
TCC apply concerns

Oversized 2-6 Clutch Regulator Valve Kit 124740-66K

Helps cure:

1-2 Flare
5-6 Flare
2nd Slip
6th Slip
No 2nd
No 6th
Ratio codes
2-6 Clutch burned
Erratic shift timing

Tooling:

F-124740-TL66

Oversized Actuator Feed Accumulator Piston Kit 124740-65K

Helps cure:

Harsh shifts
Soft shifts
Solenoid performance codes

Tooling:

124740-TL40
124740-JP40

Oversized Actuator Feed Limit Valve Kit 124740-48K

Helps cure:

Wrong gear starts
Clutch failure
Solenoid performance codes

Tooling:

F-124740-TL48
VB-FIX

Oversized Clutch Boost Valve 124740-56

Fits any of three locations.

Helps cure:

Shift quality is not load sensitive
Harsh shifts
Slips & flares
Delayed engagement
Burnt clutches
Slide shifts
Slip codes

Tooling:

F-144740-TL22
VB-FIX

Oversized Pressure Regulator Valve Kit 124740-60K

Helps cure:

Erratic line pressure
Poor shift quality
Burnt clutches
Low converter & lube flow
Overheating
TCC apply & release concerns

Tooling:

F-124740-TL60
VB-FIX

Oversized TCC Control Valve Kit 124740-14K

Helps cure:

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

Tooling:

F-124740-TL14
VB-FIX

Oversized TCC Regulator Valve Kit 124740-24K

Helps cure:

Code P0741, P0742
Harsh TCC apply
TCC slip
Loss of fuel economy
Low TCC apply pressure
Overheated fluid & TCC lining

Tooling:

F-124740-TL24
VB-FIX

TCC Regulator Valve Kit 124740-31K

Helps cure:

Code P0741, P0742
Harsh TCC apply
TCC slip
Loss of fuel economy
Low TCC apply pressure
Overheated fluid & TCC lining

Zip Kit® 6T70-G2-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

Other

Tool Kit F-124740-TL60

Tooling:

VB-FIX

Tool Kit F-124740-TL24

Tooling:

VB-FIX

Tool Kit F-124740-TL66

Tooling:

VB-FIX

Tool Kit F-124740-TL48

Tooling:

VB-FIX

Tool Kit F-124740-TL14

Tooling:

VB-FIX

Tool Kit F-144740-TL22

Tooling:

VB-FIX

Tool Kit 124740-TL40

Tech Resources

July 01, 2020

Always Identify These Valve Bodies BEFORE You Start a Transmission Rebuild

Andrew Jessiman

June 11, 2019

GM Gen. 1 & Gen. 2 6T70, 6T75, 6T80 Identification Guide

November 09, 2018

GM Gen. 2 6T70, 6T75, 6T80 Valve Body Layout

August 09, 2018

GM Gen. 2 6T70, 6T75, 6T80 Vacuum Test Guide

February 12, 2018

Transmission Report: How Small Changes Led to the New Form & Function of Gen. 2 6T70/75 Valve Bodies

January 05, 2018

“Yaw” Won’t Believe What Was Wrong…

Dan Tucker