Extension Case Installation

INSTALLATION PROCEDURE





1. Install the following items into the extension case:
^ Two select guide pins (3).
^ Two select return springs (2).
^ Two select return spring bolts (1).
^ Tighten the return spring bolts to 20 Nm (15 ft. lbs.).

NOTICE: Refer to Fastener Notice in Service Precautions.

2. Apply GM P/N 12346240 or equivalent to the transmission extension case mating surface.
3. Install the extension case (4) to the transmission; secure with twelve bolts.
^ Tighten the extension case bolts to 28 Nm (20 ft. lbs.).
4. Apply the GM P/N 12346240, or equivalent to the extension case gearshift lever case mating surface.
5. Install the gearshift lever case to the extension case; secure with ten bolts.
^ Tighten the gearshift lever case bolts to 17 Nm (12 ft. lbs.).

6. Install the breather hose to the gearshift lever case; secure with one clamp.





7. Raise the transmission slowly until the engine is no longer in contact with the wood block between the bulkhead (2) and the distributor gear housing.
8. Remove the wood block.
9. Install the rear transmission mount to the extension case; secure with one bolt.
^ Tighten the rear transmission mount bolt to 60 Nm (44 ft. lbs.).

10. Install the rear transmission crossmember to the vehicle; secure with four bolts.
^ Tighten the rear transmission crossmember bolts to 60 Nm (44 ft. lbs.).





11. Install the two bolts to the rear transmission mount (2).
^ Tighten the rear transmission mount bolts to 60 Nm (44 ft. lbs.).

12. Remove the hydraulic jack from underneath the transmission.
13. Install the Three Way Catalytic Converter (TWC) and the muffler/tail assembly to the vehicle.





14. Install the speedometer driven gear case and the ground wire (1) to the extension case (4); secure with one bolt (2).
^ Tighten the speedometer driven gear case retaining bolt to 12 Nm (106 inch lbs.).

15. Install the speedometer cable (3) to the speedometer driven gear case.
16. Install the rear propeller shaft into the vehicle aligning the index marks made during the removal procedure; secure with four bolts and four nuts.
^ Tighten the rear propeller shaft bolts and the nuts to 50 Nm (37 ft. lbs.).

17. Apply the GM P/N 12346005, or equivalent, to the threaded portion of the transmission drain plug.





18. Install the transmission drain plug (3) into the transmission.
^ Tighten the transmission drain plug to28 Nm (20 ft. lbs.).

19. Add approximately 1.5 liters (1.6 quarts) of synthetic 75W-90 GL4 lubricant, or equivalent into the transmission oil level/filler plug (2). Oil level should be even with the bottom of the transmission oil level/filler plug (2) hole.
20. Apply GM P/N 12346004, or equivalent, to the threaded portion of the transmission oil level/filler plug (2).
21. Install the transmission oil level/filler plug (2) into the transmission.
^ Tighten the transmission oil level/filler plug (2) to 28 Nm (20 ft. lbs.).

22. Lower the vehicle.
23. Install four bolts to the fan shroud at the radiator.
^ Tighten the fan shroud bolts to 10 Nm (89 inch lbs.).

24. Install the gearshift control lever into the gearshift lever case. Refer to Gearshift Control Lever Installation.