Fluid - Differential: Testing and Inspection
Repair Instructions1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Clean any dirt or foreign material from around the rear axle housing drain plug.
3. Remove the rear axle housing drain, plug.
4. Verify that the axle lubricant level is within the following range:
^ No higher than the bottom of the plug opening
^ No lower than 15 mm (9/16 inch) below the plug opening
5. If necessary, add to or replace the axle lubricant. Use synthetic 75W-90 gear lubricant (GM P/N 12378261), meeting GM specification 9986115, or equivalent.
6. If the vehicle has a limited slip differential, add 118 ml (4 fl oz) of limited slip differential additive (GM P/N 1052358), or equivalent.
Notice: Refer to Fastener Notice in Service Precautions.
7. Install the rear axle housing drain plug.
^ Tighten the rear axle housing drain plug to 35 Nm (26 ft. lbs.).
8. Lower the vehicle.