GM Service Manual Online
For 1990-2009 cars only

Rear Axle Lubricant Level Inspection 7.6 and 1st Design 8.6 Inch Axle

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Make sure the vehicle is level.
  3. Inspect the rear axle for leaks. Repair as necessary.
  4. Clean the area around the rear axle fill plug.

  5. Object Number: 607207  Size: SH
  6. Remove the rear axle fill plug.
  7. Inspect the lubricant level.
  8. Specification
    The lubricant level should be between 0-10 mm (0-0.4 in) below the fill plug opening.

  9. If the level is low, add lubricant until the level is even with the bottom edge of the fill plug opening. Use the proper fluid. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.
  10. Notice: Refer to Fastener Notice in the Preface section.

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

  13. Lower the vehicle.

Rear Axle Lubricant Level Inspection 2nd Design 8.6 Inch Axle

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Make sure the vehicle is level.
  3. Inspect the rear axle for leaks. Repair as necessary.
  4. Clean the area around the rear axle fill plug.

  5. Object Number: 390116  Size: SH
  6. Remove the rear axle fill plug.
  7. Fabricate a dipstick from a pipe cleaner or similar item. Form the pipe cleaner into an "L".
  8. Insert the pipe cleaner into the fill plug opening with the stem facing down.
  9. Remove the pipe cleaner and measure the distance from the bend in the pipe cleaner to the lubricant level.
  10. Specification
    The distance between the bend and the lubricant level should be 15-40 mm (0.6-1.6 in).

  11. If the measurement is greater than 40 mm (1.6 in), add lubricant until the level is between 15-40 mm (0.6-1.6 in) from the bottom edge of the fill plug hole. Use the proper fluid. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.
  12. Notice: Refer to Fastener Notice in the Preface section.

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

  15. Lower the vehicle.