GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

  2. Object Number: 1689710  Size: SH
  3. Drain the rear axle.
  4. • For the 8.6 inch axle, loosen the rear cover bolts to allow the fluid to drain from the rear axle.
    • For the 9.5 inch LD and 9.5 inch HD axles, remove the drain plug.

    Object Number: 1689173  Size: SH
  5. Remove the rear axle cover bolts (1).
  6. Remove the axle housing cover (2).
  7. Remove the gasket (3).

Installation Procedure


    Object Number: 1689173  Size: SH

    Important: The axle housing gasket is reusable. Replace only if damaged.

  1. Install the axle housing cover gasket (3).
  2. Install the axle housing cover (2).
  3. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the mounting bolts (1).
  5. Tighten
    Tighten the bolts to 40 N·m (30 lb ft).


    Object Number: 1689173  Size: SH
  6. Install the drain plug (9.5 inch axle only).
  7. Tighten
    Tighten the drain plug to 33 N·m (24 lb in).

  8. Fill the rear axle with fluid.
  9. Specification
    The lubricant level should be between 0-13 mm (0-0.50 inch) below the fill plug opening.

  10. If the level is low, add lubricant until the level is even with the bottom of the fill plug opening. Use the proper fluid, refer to Fluid and Lubricant Recommendations .
  11. Lower the vehicle.