GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 715660  Size: SH
  1. Raise and suitably support 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 front propeller shaft. Refer to Front Propeller Shaft Replacement in Propeller Shaft.
  4. Remove the motor/encoder electrical connector.

  5. Object Number: 662850  Size: SH
  6. Remove the motor/encoder mounting bolts.
  7. Remove the motor/encoder unit from the transfer case.
  8. Remove the motor/encoder silicone gasket.

Installation Procedure

Important: 

   • If the motor/encoder assembly is being replaced because it is defective, make sure that the transfer case is in the neutral position. Manually shift the unit at the shift shaft. Use a crescent wrench if necessary.
   • If the motor/encoder is being replaced, a new gasket will come with the motor/encoder. DO NOT use the old gasket.


    Object Number: 804163  Size: SH
  1. Install the motor/encoder gasket to the transfer case.
  2. Important: When installing the motor/encoder unit to the transfer case, make sure that the transfer case is indexed properly and is flat against the transfer case before tightening the mounting bolts.

  3. Install the motor/encoder to the transfer case.
  4. 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.

  5. Install the motor/encoder mounting bolts.
  6. Tighten
    Tighten the bolts, in the sequence shown, to 20 N·m (15 lb ft).


    Object Number: 715660  Size: SH
  7. Install the motor/encoder electrical connector. Ensure that the retention clips activate.
  8. Install the front propeller shaft. Refer to Front Propeller Shaft Replacement in Propeller Shaft.
  9. Install the transfer case shield. Refer to Transfer Case Shield Replacement .
  10. Lower the vehicle.