Y Car MM6 and MY6

Trans Case and Adapter Plate Assemble (Y Car MM6 and MY6)

Transmission Case

^ Tools Required
- J 8092 Universal Driver Handle
- J 36190 Universal Driver Handle
- J 39435 Bearing Race Installer
- J 39439-4 Bushing Installer
- J 39439-3 Bushing Installer





1. Install the 1st/2nd and the 3rd/4th shift shaft bushings. Use the J 36190, the J 39439-4, and the J 39439-3.





2. Install the mainshaft bearing race, using the J 8092 and the J 39435.





3. Install the countershaft bearing race, using the J 8092 and the J 39435.





4. Install the dowel pins.





5. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the reverse lamp switch.





6. Notice: Refer to Fastener Notice in Service Precautions.

Install the reverse lamp switch.
^ Tighten the switch to 27 Nm (20 ft. lbs.).

7. Install the coolant temperature sensor (MY6 only).
^ Tighten the sensor to XX Nm (XX ft. lbs.).





8. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the transmission case fill plug (1), MM6 only.





9. Install the transmission case fill plug (1), MM6 only.
^ Tighten the transmission case fill plug to 18 Nm (13 ft. lbs.).





10. Notice: The H-pattern on the guide plate must face the extension housing. If the guide plate is installed incorrectly, then damage will occur.

Install the guide plate and the guide plate bolts.
^ Tighten the bolts to 22 Nm (16 ft. lbs.).

Adapter Plate

^ Tools Required
- J 39433 Input Shaft Seal Installer
- J 39439-1 Shift Rail Bushing Remover/Installer
- J 42464 Shift Shaft Seal Installer
- J 42496 Inner Shift Rail Inner Seal Installer





1. Install the dowel pins.





2. Notice: If the 1st/2nd, 3rd/4th speed shift shaft bushing is installed incorrectly it will interfere with the inner shift rail seal causing a leak.

Install the 1st/2nd, 3rd/4th speed shift shaft bushing flush with adapter plate, using the J 39439-1.





3. Install the inner shift rail seal (1) using the J 42496. Garter spring should face inside of transmission.
4. Install the outer shift rail seal (2) using the J 42464.





5. Install the input shaft seal, using the J 39433.





6. Install the countershaft bearing shim and bearing race.





7. Install the input shaft bearing shim and bearing race.