Seals and Gaskets: Service and Repair

^ Tools Required
- J 38807 Rear Drive Gear Bearing Retainer Seal Installer
- J 39314 Vibration Damper Installer
- J 38805 Main Shaft Nut Socket
- J 38805 Main Shaft Nut Socket

Removal Procedure





1. Raise the vehicle. Refer to Vehicle Lifting.
2. Remove the rear propeller shaft. Refer to Propeller Shaft Replacement - One Piece or Propeller Shaft Replacement - Two Piece.
3. Remove the transfer case. Refer to Transfer Case Replacement.
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 using J 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.

Installation Procedure





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: Refer to Fastener Notice in Service Precautions.





3. Install the main drive gear bearing retainer to the transmission with four bolts.
Tighten the bolts to 35 Nm (26 ft. lbs.).





4. Install the vibration damper to the mainshaft using J 39314.





5. Install the mainshaft washer and nut using J 38805.
Tighten the nut to 441 Nm (325 ft. lbs.).





6. Install the extension housing to the transmission with eight bolts.
Tighten the nut to 54 Nm (40 ft. lbs.).
7. Install the transfer case. Refer to Transfer Case Replacement.
8. Install the rear propeller shaft. Refer to Propeller Shaft Replacement - One Piece or Propeller Shaft Replacement - Two Piece.
9. Check the transmission oil level. Refer to Fluid Replacement.
10. Lower the vehicle.