This TransGo
6T40-G2 SHIFT KIT® Valve Body Repair Kit fits 2013 and newer General
Motors vehicles equipped with GEN2 6T30, 6T40, 6T45 and 6T50 automatic
transmission. These transmissions often come in with complaints of soft
or flare up on shifts, burned friction plates, TCC slip as well as
various solenoids and gear ratio codes. This kit does not fit GEN1 units.
These complaints are often the result of wear at the actuator feed
limit (AFL) valve. 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 these complaints is at the spring end of the
pressure regulator valve. This is the EPC boost area of the valve. When
bore or valve wear occurs here, it causes a loss of EPC boost signal
oil. The end result is lazy or low-pressure boost response, low line
pressure, clutch slippage, solenoid performance and gear ratio codes.
Lastly, the TCC regulator valve bore wears out causing the TCC slip
problems and codes.
Features and benefits:
The kit includes an oversized AFL valve. The new valve is oversize, therefore 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. Lastly, a new
design PR valve with longer lands restores the function and reliability
of the pressure regulator system.
Corrects/Prevents/Reduces:
- Erratic or hunting TCC
- Soft shifts or flare up on shifts
- Burned friction plates
- Slow pressure boost response
- Codes P0741, P0751, P0752, P0776, P0777, P0796, P0797, P2714, P2715, P2723 and P2724
Includes:
- Drop-in USA-made hardened steel PR valve and 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 (for sizing only)
