Transmission Housing Oil Seal Replacement Rear Seal Replacement(2WD)

Tools Required

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the rear propeller shaft. Refer to Two-Piece Propeller Shaft Replacement in Propeller Shaft.
3. Remove the following:

•	Remove the mainshaft nut.

•	Remove the washer.

•	Remove the rubber washer spline seal.

•	Remove the yoke.




4. Remove the rear oil seal from the rear case using the J 6125-B (1) and the J 23129 (2).
5. Remove the rear oil seal from the extension housing.

1. Using J 22834-A install the new rear oil seal into the extension housing.



2. EnsureJ 22834-A is centered on the seal during installation.



3. Install the following:

•	Install the yoke.

•	Install the rubber washer spline seal.

•	Install the washer.

•	Install the mainshaft nut.




4. Use the J 8614-01 in order to hold the transmission from rotating.
5. Tighten the main shaft nut.

Tighten
Tighten the main shaft nut to 441 N·m (325 lb ft).

6. Install the rear propeller shaft. Refer to Two-Piece Propeller Shaft Replacement in Propeller Shaft.
7. Check the transmission oil level. Refer to Fluid Replacement .
8. Lower the vehicle.

Transmission Housing Oil Seal Replacement 4WD

Tools Required

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the rear propeller shaft. Refer to One-Piece Propeller Shaft Replacement or Two-Piece Propeller Shaft Replacement in Propeller Shaft.
3. Remove the transfer case. Refer to Transfer Case Replacement in NV246 Automatic



4. Perform the following:

•	Remove the bolts securing the extension housing to the transmission.

•	Remove the extension housing from the transmission.




5. Remove the mainshaft nut and washer from the mainshaft usingJ 38805 .



6. Remove the vibration damper from the mainshaft using a suitable gear puller.



7. Mark the main drive gear bearing retainer and case for alignment.
8. Remove four bolts securing the main drive gear bearing retainer.
9. Remove the main drive gear bearing retainer.



10. Remove the seal from the main drive gear bearing retainer.

1. Install the seal into the main drive gear bearing retainer using J 38807 .

Important: Ensure the oil hole on the main drive gear bearing retainer is not covered with the sealant.




2. Apply sealant GM P/N 12346004 to the main drive gear bearing retainer mating surface.




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 main drive gear bearing retainer to the transmission with four bolts.

Tighten
Tighten the bolts to 35 N·m (26 lb ft).




4. Install the vibration damper to the mainshaft usingJ 39314 .



5. Install the mainshaft washer and nut usingJ 38805 .

Tighten
Tighten the nut to 441 N·m (325 lb ft).




6. Install the extension housing to the transmission with eight bolts.

Tighten
Tighten the nut to 54 N·m (40 lb ft).

7. Install the transfer case. Refer to Transfer Case Replacement in NV246 Automatic
8. Install the rear propeller shaft. Refer to One-Piece Propeller Shaft Replacement or Two-Piece Propeller Shaft Replacement in Propeller Shaft.
9. Check the transmission oil level. Refer to Fluid Replacement .
10. Lower the vehicle.