GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 707039  Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General information.
  2. Remove the transfer case shield. Refer to Transfer Case Shield Replacement .
  3. Remove the rear propeller shaft.
  4. • For vehicles equipped with the one piece propeller shaft, refer to One-Piece Propeller Shaft Replacement in Propeller Shaft.
    • For vehicles equipped with the two piece propeller shaft, refer to Two-Piece Propeller Shaft Replacement in Propeller Shaft.
  5. Remove the front propeller shaft. Refer to Front Propeller Shaft Replacement in Propeller Shaft.
  6. Drain the transfer case of fluid. Refer to Transfer Case Fluid Replacement .

  7. Object Number: 648014  Size: SH
  8. Remove the motor/encoder electrical connector.

  9. Object Number: 647994  Size: SH
  10. Remove the transfer case electrical wiring harness.

  11. Object Number: 715667  Size: SH
  12. Remove the transfer case vent hose.
  13. Support the transmission with a suitable jack stand.

  14. Object Number: 647997  Size: SH
  15. Remove the transmission mount retaining bolts.

  16. Object Number: 680767  Size: SH
  17. Remove the transmission support assembly. Refer to Transmission Support Replacement in Frame and Underbody.

  18. Object Number: 648001  Size: SH
  19. Remove the transmission mount from the transfer case adapter (automatic transmission only).

  20. Object Number: 648011  Size: SH
  21. Remove the transfer case retaining nuts.
  22. Important: The following service procedure should be performed with the aid of another technician.

  23. Remove the transfer case from the transfer case adapter straight back toward the rear of the vehicle.
  24. Lower the front of the transfer case.
  25. Raise the rear of the transfer case so that it above the torsion bar bracket.
  26. In a downward motion, remove the transfer case from the vehicle.

  27. Object Number: 654219  Size: SH

    Important: If during the removal of the transfer case the gasket becomes damaged, do not reuse the gasket. Replace the damaged gasket with a new one. DO NOT use any type of sealant in place of the gasket.

  28. Remove the transfer case gasket.

Installation Procedure


    Object Number: 654219  Size: SH
  1. Install the new gasket to the transfer case (tab facing upward).

  2. Object Number: 648011  Size: SH

    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.

    Important: The following service procedure should be performed with the aid of another technician.

  3. Install the transfer case assembly.
  4. Tighten
    Tighten the transfer case retaining nuts to 55 N·m (39 lb ft).


    Object Number: 648001  Size: SH
  5. Install the transmission mount assembly.
  6. Tighten
    Tighten the transmission mount bolts to 55 N·m (40 lb ft).


    Object Number: 680767  Size: SH
  7. Install the transmission support assembly. Refer to Transmission Support Replacement in Frame and Underbody.

  8. Object Number: 647997  Size: SH
  9. Install the transmission mount retaining nuts.
  10. Tighten
    Tighten the transmission mount retaining nuts to 40 N·m (30 lb ft).

  11. Remove the transmission jack from the transmission.

  12. Object Number: 648014  Size: SH
  13. Install the motor/encoder electrical connector.

  14. Object Number: 647994  Size: SH
  15. Install the motor/encoder electrical wiring harness.

  16. Object Number: 715667  Size: SH
  17. Install the transfer case vent hose.
  18. Install the rear propeller shaft.
  19. • For vehicles equipped with the one piece propeller shaft, refer to One-Piece Propeller Shaft Replacement in Propeller Shaft.
    • For vehicles equipped with the two piece propeller shaft, refer to Two-Piece Propeller Shaft Replacement in Propeller Shaft.
  20. Install the front propeller shaft. Refer to Front Propeller Shaft Replacement in Propeller Shaft.
  21. Fill the transfer case with the approved fluid. Refer to Transfer Case Fluid Replacement .

  22. Object Number: 707039  Size: SH
  23. Install the transfer case shield. Refer to Transfer Case Shield Replacement .
  24. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.