This TransGo
6T70-G2 SHIFT KIT® Valve Body Repair Kit fits 2013 and newer General
Motors vehicles equipped with a GEN2 6T70, 6T75 and 6T80 automatic
transmission. Common complaints with this transmission are erratic
shifts, broken parts, TCC slip as well as various solenoid performance
and gear ratio codes. This kit does not fit GEN1 units.
One source of the shift complaints is the wear at the actuator feed
limit (AFL) valve bore. The purpose of the AFL valve is to limit the
pressure going to the solenoids. The AFL valve spring is calibrated to
prevent the solenoid feed pressure from exceeding a predetermined PSI,
no matter what main line pressure is. This is necessary to prevent more
fluid from being fed to the solenoids than they can effectively regulate
and limit what max line pressure output is. If the pressure feeding the
solenoids is too high or too low, their output will also be too high or
too low. As a result, shift quality complaints and codes can occur
along with low or high main line pressure.
The other source of the shift related complaints is wear at the
pressure regulator valve and or bore. When the valve or bore wear
occurs, EPC boost signal oil is going to be low. The end result is lazy
or slow pressure boost response and the related symptoms similar to the
worn AFL system.
The TCC slip problems can occur in this transmission from wear at the
TCC regulator valve bore. This kit addresses the wear with a redesigned
valve that incorporates a scarf cut sealing ring and extended land that
restores the integrity of the valve bore. Lastly, a new relief system
prevents expensive hard part damage due to accidental pressure spikes.
Features and benefits:
The kit includes an oversized AFL valve. The new valve is oversize which means you will need the TransGo tool-kit part # AFL-G2-TK to ream the bore. This universal tool-kit works for all GEN2 6F35, 6T30, 6T40, 6T45, 6T50, 6T70, 6T75 and 6T80 transmissions.
A new drop-in hardened steel TCC regulator valve that has
re-positioned longer lands and incorporates a groove where a scarf cut
seal is fitted so that it seals in the original worn bore. Also, a new
design PR valve with longer lands restores the function and reliability
of the pressure regulator system. Lastly, a new pressure relief system
replaces the OE isolator valve line-up. This new system prevents
expensive hard part damage due to pressure over boost.
Corrects/Prevents/Reduces:
- Erratic or hunting TCC
- Broken parts due to over boost
- Codes P0741, P0742, P0751, P0752, P0776, P0777, P0796, P0797, P2714, P2715, P2723 and P2724
Includes:
- Drop-in USA-made hardened steel PR valve
- PR valve spring
- Oversized USA-made hardened steel AFL valve
- Drop-in USA-made hardened steel TCC regulator valve, scarf cut sealing ring, spring and O-ring
- Drop-in pressure relief bushing, spring, ball and retainer
