GM Service Manual Online
For 1990-2009 cars only

    Object Number: 814133  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Clean any dirt from around the differential fill plug.
  3. Remove the fill plug from the differential and drain the fluid.
  4. Check the differential fluid level. It should be even with the bottom of the fill plug hole to no lower than 6 mm (0.25 in) below the opening.
  5. Add new fluid if necessary.
  6. Fill the differential with 75W90 synthetic axle lubricant. Refer to Approximate Fluid Capacities and Lubrication Specifications.
  7. Caution: Refer to Fastener Caution in the Preface section.

  8. Install the differential fill plug to the differential and tighten to 35 N·m (26 lb ft).
  9. Lower the vehicle.