GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Envoy - 2WD 🢒 Engine 🢒 Engine Electrical 🢒 Transfer Case Assembly Replacement

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Drain the transfer case. Refer to Transfer Case Fluid Replacement .
  3. Remove the rear propeller Shaft. Refer to Rear Propeller Shaft Replacement .
  4. Remove the front propeller shaft. Refer to Front Propeller Shaft Replacement .

    5. Object Number: 747096 Size: SH
  5. Remove the electrical harness from the retainer.

    6. Object Number: 746670 Size: SH
  6. Disconnect the electrical connector from the speed sensor.

    7. Object Number: 747097 Size: SH
  7. Disconnect the vent hose.
  8. Install a transmission jack for the transfer case.

    9. Object Number: 879658 Size: SH
  9. Remove the transfer case adapter (2) to transfer case nuts (5).
  10. Lower the transfer case.

    11. Important: The transfer case gasket may become damaged during the removal procedure.

  11. Disconnect the electrical harness from the top of the transfer case.
  12. Remove the transfer case.
  13. Remove the transfer case gasket (4).

Installation Procedure

    Object Number: 879658 Size: SH

    Important: If the transfer case gasket is damaged, replace it. DO NOT use silicone sealant in place or with the transfer case gasket.

  1. Install or replace the transfer case gasket (4).
  2. Raise the transfer case and install the electrical harness.
  3. Install the transfer case (3) in the vehicle.

    4. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the transfer case adapter (2) to transfer case nuts (5). Ensure the fuel line retainer (1) is in place.

    5. Tighten
    Tighten the nuts to 47 N·m (35 lb ft).

  5. Remove the transmission jack stand.

    6. Object Number: 746670 Size: SH
  6. Connect the electrical connector to the speed sensor.

    7. Object Number: 747097 Size: SH
  7. Connect the vent hose.
  8. Install the transfer case harness to the transfer case.

    9. Object Number: 747096 Size: SH
  9. Install the rear propeller shaft. Refer to Rear Propeller Shaft Replacement .
  10. Install the front propeller shaft. Refer to Front Propeller Shaft Replacement .
  11. Fill the transfer case with fluid. Refer to Transfer Case Fluid Replacement .
  12. Lower the vehicle. Refer to Lifting and Jacking the Vehicle .