GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Apply the parking brake.
  2. Block the wheels.

  3. Object Number: 198550  Size: MH
  4. Remove the rear axle shaft housing cover nuts (1).
  5. Remove the rear axle shaft housing cover washers (2).

  6. Object Number: 198557  Size: SH

    Notice: Do not strike the rear axle housing cover with a hammer. This may damage the rear axle shaft. Do not use a chisel or wedge to loosen the rear axle shaft or rear axle housing cover locators. This will damage the wheel hub, rear axle shaft, and rear wheel hub seals.

  7. Remove the rear axle shaft housing locators (3).
  8. 5.1. Hold a brass drift against the center of the rear axle housing cover.
    5.2. Strike the brass drift with a sharp blow using the 2.3 kg (5 lb) hammer.

    Important: Tag the rear axle shafts in order to identify the right and the left rear axle shaft location for reassembly.

  9. Remove the rear axle shaft.
  10. Remove the rear axle housing cover gaskets.

Installation Procedure


    Object Number: 198554  Size: SH
  1. Install the new rear axle shaft housing cover gasket (5).
  2. Install the rear axle shaft (4).
  3. 2.1. Dip the splined end of the rear axle shaft into the synthetic lubricant before installing. Refer to Fluid and Lubricant Recommendations for rear axle lubricant specifications.
    2.2. Rotate the rear axle shaft as needed in order to align the rear axle shaft housing cover holes with the studs.
  4. Install the rear axle shaft housing cover locators (3).
  5. Install the rear axle shaft housing cover 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 rear axle shaft housing cover nuts (1).
  8. Tighten

        • Tighten the rear axle shaft housing nuts (12 -stud rear axle) to 77 N·m (57 lb ft).
        • Tighten the rear axle shaft housing nuts (8 -stud rear axle) to 155 N·m (114 lb ft).

    Object Number: 198562  Size: MH

    Important: There must be clearance between the rear axle shaft housing cover washers and the rear shaft housing cover. If the rear axle shaft housing cover washers contact the rear axle shaft housing cover, remove the rear axle shaft and inspect and replace the faulty parts.

  9. Inspect for clearance between the rear axle shaft housing and the rear axle shaft housing cover washers.
  10. Remove the wheel blocks.