GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 199043  Size: SH

    Important: Shift the axle control switch to the LOW range.

  1. Remove the wiring harness clip nut (1).
  2. Remove the wiring harness clip (2) from the stud.

  3. Object Number: 199122  Size: SH
  4. Disconnect the wiring harness connector.

  5. Object Number: 199050  Size: SH
  6. Remove the shift motor mounting stud nuts (1).
  7. Remove the washers (2).
  8. Remove the shift motor (6).
  9. Remove the spring from the shift fork (4).
  10. Remove the seal (5) from the differential carrier housing (3).

Installation Procedure


    Object Number: 199050  Size: SH
  1. Install the seal (5) onto the differential carrier housing (3).
  2. Install the spring onto the shift fork (4).
  3. Important: Ensure that the actuator lever engages with the shift fork (4).

  4. Install the shift motor (6) onto the mounting studs.
  5. Install the washers (2).
  6. 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.

  7. Install the shift motor mounting stud nuts (1).
  8. Tighten
    Tighten the nuts (1) to 54 N·m (40 lb ft).


    Object Number: 199122  Size: SH
  9. Connect the wiring harness connector to the shift motor.

  10. Object Number: 199043  Size: SH
  11. Install the wiring harness clip (2) onto the stud.
  12. Install the wiring harness clip nut (1).
  13. Tighten
    Tighten the nut (1) to 1.9 N·m (17 lb in).

  14. Turn the ignition switch to the ON position.
  15. Verify proper operation of the system.