Tools Required

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

Important: An index mark, reference mark, should be made on the rear propeller shaft pinion flange yoke and the rear differential pinion flange to ensure that the rear propeller shaft is installed in the same position from which it was removed. If this precaution is not observed, a driveline imbalance may result causing vibration, premature component wear or other undesirable conditions.

2. Place an index mark on the rear propeller shaft pinion flange yoke and the rear differential pinion flange.
3. Remove the 4 bolts, the 4 nuts and rear propeller shaft from the vehicle.



4. Remove the rear output shaft oil seal (1) from the transfer case using J 26941 with J 23907 .

1. Install the new rear output shaft oil seal into the transfer case (1) using J 37751 .
2. Apply J 36850 to the new rear output shaft oil seal lip.

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.

3. Install the rear propeller shaft into the vehicle. Secure the shaft with the 4 bolts and the 4 nuts.

Tighten
Tighten the rear propeller shaft bolts and nuts to 50 N·m (37 lb ft).

4. Check the transfer case oil level. Refer to Oil Replacement .
5. Apply GM P/N 12346004 (Canadian P/N 10953480), or the equivalent, to the threaded portion of the transfer case oil level/filler plug.
6. Install the transfer case oil level/filler plug into the transfer case.

Tighten
Tighten the transfer case oil level/filler plug to 28 N·m (21 lb ft).

7. Lower the vehicle.