Transfer Case Replacement

Removal Procedure





1. Raise and support the vehicle. Refer to Vehicle Lifting.
2. Remove the transfer case shield. Refer to Shield Replacement.
3. Remove the rear propeller shaft. Refer to Propeller Shaft Replacement - One Piece or Propeller Shaft Replacement - Two Piece or Propeller Shaft Replacement - Three Piece.
4. Remove the front propeller shaft. Refer to Propeller Shaft Replacement (Front Axle-All Except NP8).
5. Disconnect the vehicle speed sensor electrical connector.
6. Disconnect the wiring harness from the transfer case.





7. Disconnect the transfer case shift cable at the transfer case. Refer to Shift Cable Replacement.
Support the transfer case with a jack.





8. Remove the bolts securing the transfer case to the transmission adapter.
9. Remove the gasket.





10. Discard the gasket.

Installation Procedure





1. Install a new gasket to the transmission. Use sealer GM P/N 12346004 in order to hold the gasket in place.





2. Install the transfer case to the transmission adapter.

Notice: Refer to Fastener Notice in Service Precautions.

3. Install the bolts that secure the transfer case to the transmission adapter.
Tighten the bolts to 45 Nm (33 ft. lbs.).
4. Remove the jack from the transfer case.
5. Install the transfer case shift linkage at the transfer case.
6. Install the electrical connectors and the wiring harness to the transfer case with the new straps.
7. Install the rear propeller shaft. Refer to Propeller Shaft Replacement - One Piece or Propeller Shaft Replacement - Two Piece or Propeller Shaft Replacement - Three Piece.
8. Install the front propeller shaft. Refer to Propeller Shaft Replacement - Two Piece.
9. Install the transfer case shield, Refer to Shield Replacement.
10. Check the transfer case lubricant level. Add oil as necessary. Refer to Capacities - Approximate Fluid.
11. Lower the vehicle.