For 1990-2009 cars

#### Tools Required

• | J 8092 Universal Driver

• | J 21465-13 Drive Handle Extension

• | J 25070 Heat Gun - 500-750 F

• | J 44741 Shift Rail Bearing Installer

• | J 44745 Countershaft Bearing Race Installer

• | J 44746 Mainshaft/Input Shaft Bearing Race Installer

1. Apply Teflon sealer GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the transmission vent.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the transmission vent.

Tighten
Tighten the transmission vent to 10 N·m (88 lb ft).

3. Install a new power take-off (PTO) cover gasket to the case.
4. Install the PTO cover.
5. Clean the old threadlocker from the PTO cover bolt threads.
6. Apply threadlocker GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the PTO cover bolts.
7. Install the PTO bolts.

Tighten
Tighten the PTO cover bolts in a cross torque pattern to 38 N·m (28 lb ft).

8. Using the J 25070 , heat the front case for 10-15 minutes.

Important: With the front case still hot, install the bearing races. Do not allow the front case to cool.

9. Install the shift rail bearing, with the part number up, in the front case using the J 8092 (1) and the J 44741 (2). The J 44741 (2) will position the bearing to the proper depth.

Important: With the front case still hot, install the bearing races. Do not allow the front case to cool.

10. Install the countershaft front bearing race using the J 8092 (1), J 21465-13 (2), and the J 44745 (3).

Do not install the countershaft bearing shims at this time. The shims will be installed after the preload is determined.

11. Install the mainshaft front bearing race using the J 8092 (1), J 21465-13 (2), and the J 44746 (3).

Do not install the mainshaft front bearing shims or the oil deflector at this time. The shims and the oil deflector will be installed after the preload is determined

12. Allow the front case to cool.