GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Astro - 4WD 🢒 Driveline/Axle 🢒 Rear Drive Axle 🢒 Axle Lubricant Change

Removal Procedure
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    2. Object Number: 392774 Size: SH
  2. Remove the rear axle fill plug.

    3. Object Number: 1500 Size: SH
  3. Remove the rear axle housing cover and the rear axle housing cover gasket.
  4. Drain the lubricant into a suitable container.
  5. Inspect the drain plug for excessive metal particle accumulation. This accumulation is symptomatic of extreme wear.
  6. Clean the drain plug.

Installation Procedure

    Object Number: 1500 Size: SH
  1. Install the new rear axle housing cover gasket and the rear axle housing cover.

    2. 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.

  2. Install the rear axle housing cover bolts.

    3. Tighten
    Tighten the rear axle housing cover bolts to 30 N·m (22 lb ft).

  3. Fill the rear axle. Use the proper fluid. Refer to Approximate Fluid Capacities and Fluid and Lubricant Recommendations in Maintenance and Lubrication.

    4. Object Number: 392774 Size: SH
  4. Install the rear axle fill plug.

    5. Tighten
    Tighten the rear axle fill plug to 33 N·m (24 lb ft).

  5. Lower the vehicle.