For 1990-2009 cars

### Draining Procedure

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Clean any dirt from around the differential drain plug.
3. Position a drain pan under drain plug.
4. Remove the drain plug from the differential and drain the fluid.

### Filling Procedure

Caution: Refer to Fastener Caution in the Preface section.

1. Install the drain plug to the differential and tighten to 35 N·m (26 lb ft)..
2. Clean any dirt from around the differential fill plug.
3. Remove the fill plug from the differential.

Note: If equipped with a limited slip differential, limited slip differential lubricant additive, GM P/N 1052358 (Canadian P/N 992694) or equivalent must be added first. Refer to Lubrication Specifications . Approximately 0.23 L (7.8 oz) of residual fluid will remain in the differential.

4. Fill the differential with 75W90 synthetic axle lubricant, GM P/N 12378261 (Canadian P/N 10953455) or equivalent. Refer to Lubrication Specifications.
5. Inspect the gear lubricant level to ensure it is even with the bottom of the fill plug hole to no lower than 6 mm (0.25 in) below the opening.
6. Install the fill plug to the differential and tighten to 35 N·m (26 lb ft).
7. Lower the vehicle.