Rear Axle Lubricant Replacement 8.6, 9.5 Inch Axle

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Clean the area around the rear axle fill plug.



3. Remove the rear axle fill plug.
4. Remove the rear axle cover. Refer to Rear Axle Housing Cover and Gasket Replacement.
5. Drain the lubricant into a suitable container.

1. Install the rear axle cover. Refer to Rear Axle Housing Cover and Gasket Replacement.
2. Fill the rear axle with axle lubricant. Use the proper fluid. Refer to Approximate Fluid Capacities and Adhesives, Fluids, Lubricants, and Sealers.

Caution: Refer to Fastener Caution in the Preface section.




3. Install the rear axle fill plug and tighten to 33 N·m (24 lb ft)..
4. Remove the support and lower the vehicle.

Rear Axle Lubricant Replacement 9.75, 10.5 and 10.75 Inch Axles

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



2. Remove the fill plug.
3. Remove the rear axle housing cover bolts.

Discard the bolts.

4. Remove the rear axle housing cover.

Drain the lubricant into a suitable container.

5. Remove the sealant from the rear axle housing and the rear axle housing cover.

1. Apply an approximately 3.18-6.35 mm (1/8-1/4 in) high and 3.18-6.35 mm (1/8-1/4 in) wide bead of sealant, GM P/N 12346240 (Canadian P/N 10953493) or equivalent, to the rear axle housing cover.

The sealant is to be applied in the middle of the rear axle housing cover flange and on the inside of all bolt hole openings as shown.




2. Install the rear axle housing cover.

Caution: Refer to Fastener Caution in the Preface section.

3. Install the new rear axle housing cover bolts and tighten to 61 N·m (45 lb ft).

Note: Allow the sealant to cure for one hour before filling the axle with axle lubricant.

4. Fill the rear axle with axle lubricant. Use the proper fluid. Refer to Approximate Fluid Capacities and Fluid and Lubricant Recommendations.
5. Install rear axle fill plug and tighten to 33 N·m (24 lb ft).
6. Lower the vehicle.