L. Transmission Cover

NOTE: Place selector arm plates and shift rail in neutral position (centered). Rotate shift rail until selector arm disengages from selector arm plates and roll pin is accessible.





DISASSEMBLE
1. Selector arm roll pin using a pin punch and a hammer.
2. Shift rail, shift forks, shift fork plates, selector arm, interlock plate and roll pin.
3. Transmission cover to extension housing O-ring seal using a screwdriver.
4. Nylon inserts and shift fork plates from shift
- Note position of inserts and plates for assembly reference.

ASSEMBLE
1. Nylon inserts and shift fork plates in shift forks.
- If removed, coat edges of shift rail plug with sealer GM P/N 1052624, or equivalent, before installing.
- Coat shift rail and rail bores with transmission lubricant.
2. Shift rail in cover until flush with inside edge of cover.
3. Place 1st/2nd shift fork in cover with fork offset facing rear of cover and push shift rail through fork.
- The 1st/2nd shift fork is the larger of the two forks.
4. Selector arm and C-shaped interlock plate in cover and insert shift rail through arm.
- Widest part of interlock plate must face away from cover, and selector arm roll pin hole must face downward and toward rear of cover.
5. 3rd/4th shift fork in cover with fork offset facing rear of cover.
6. Shift rail through 3rd/4th shift fork and into front bore in cover.
- Rotate shift rail until shift fork plate at forward of rail faces away from, but is parallel to cover.
- Align roll pin holes in selector arm and shift rail and install roll pin. Roll pin must be flush with surface of selector arm to prevent pin from contacting shift fork plates during shifts.
7. New transmission cover to extension housing O-ring seal.
- Coat O-ring seal with transmission lubricant.