GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 8614-01 Flange and Pulley Holding Tool
    • J 22536 Pinion Driver
    • J 38694 Extension Housing Oil Pump/Seal Installer

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  3. Remove the brake calipers. Refer to Rear Brake Caliper Replacement in Disc Brakes.
  4. Remove the brake rotors. Refer to Rear Brake Rotor Replacement in Disc Brakes.
  5. Remove the axle shafts. Refer to Rear Axle Shaft Replacement .
  6. Remove the differential assembly. Refer to Differential Replacement .
  7. Remove the drive pinion yoke and the oil seal. Refer to Drive Pinion Flange/Yoke and/or Oil Seal Replacement .

  8. Object Number: 683960  Size: SH
  9. Install the J 22536 as shown.
  10. Ensure that the J 22536 is firmly seated on the pinion.

  11. Drive the pinion out using the J 22536 and a hammer.
  12. Strike the J 22536 slowly. Do not let the pinion fall out of the rear axle housing.


    Object Number: 9731  Size: SH
  13. Remove the collapsible spacer from the pinion. Discard the spacer.
  14. Remove the pinion bearings and the cups. Refer to Drive Pinion Bearings Replacement .

  15. Object Number: 1265145  Size: SH

    Important: The ring gear bolts have left-hand threads.

  16. Remove the ring gear bolts. Discard the bolts.

  17. Object Number: 1265151  Size: SH
  18. Remove the ring gear from the differential case. Drive the gear off with a brass drift if necessary.

Installation Procedure


    Object Number: 866505  Size: SH

    Important: The mating surface of the ring gear and the differential case must be clean and free of burrs before installing the ring gear.

  1. Install the ring gear to the differential case.

  2. Object Number: 1265145  Size: SH

    Important: The ring gear bolts have left-hand threads.

  3. Install the new ring gear bolts.
  4. Hand start each bolt to ensure that the ring gear is properly installed to the differential case.

    Notice: Refer to Fastener Notice in the Preface section.

  5. For vehicles equipped with the 8.6 axle, tighten the new ring gear bolts alternately and in stages, gradually pulling the ring gear onto the differential case.
  6. Tighten
    Tighten the ring gear bolts in sequence to 120 N·m (89 lb ft).

  7. For vehicles equipped with the 9.5/9.5 LD axle, tighten the new ring gear bolts alternately and in stages, gradually pulling the ring gear onto the differential case.
  8. Tighten
    Tighten the ring gear bolts in sequence to 140 N·m (103 lb ft).

  9. Install the drive pinion bearing cups. Refer to Drive Pinion Bearings Replacement .
  10. Determine the selective shim thickness for the pinion gear. Refer to Pinion Depth Adjustment .
  11. Install the selective shim onto the pinion.
  12. Install the inner pinion bearing onto the drive pinion. Refer to Drive Pinion Bearings Replacement .
  13. Install a new collapsible spacer.
  14. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.
  15. Install the pinion to the axle housing.
  16. Install the outer pinion bearing.

  17. Object Number: 651744  Size: SH
  18. Install a new pinion oil seal using the J 38694 .
  19. Apply sealant, GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the splines of the pinion yoke.

  20. Object Number: 788905  Size: SH
  21. Install the pinion yoke.
  22. Align the marks made during removal.

  23. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke.
  24. Install the washer and a new pinion nut.

  25. Object Number: 788482  Size: SH
  26. Install the J 8614-01 onto the pinion yoke as shown.
  27. Important: If the rotating torque is exceeded, the pinion will have to be removed and a new collapsible spacer installed.

  28. Tighten the pinion nut while holding the J 8614-01 .
  29. Tighten
    Tighten the pinion nut until the pinion end play is just taken up. Rotate the pinion while tightening the nut to seat the bearings.


    Object Number: 661077  Size: SH
  30. Measure the rotating torque of the pinion using an inch-pound torque wrench.
  31. Specification
    The rotating torque of the pinion should be 1.0-2.3 N·m (10-20 lb in) for used bearings or 1.7-3.4 N·m (15-30 lb in) for new bearings.

  32. If the rotating torque measurement is below 1.0 N·m (10 lb in) for used bearings, or 1.7 N·m (15 lb in) for new bearings, continue to tighten the pinion nut.
  33. Tighten
    Tighten the pinion nut, in small increments, as needed, until the torque required in order to rotate the pinion is 1.0-2.3 N·m (10-20 lb in) for used bearings or 1.7-3.4 N·m (15-30 lb in) for new bearings.

  34. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated.
  35. Recheck the rotating torque and adjust if necessary.

  36. Install the differential assembly. Refer to Differential Replacement .
  37. Install the axle shafts. Refer to Rear Axle Shaft Replacement .
  38. Install the brake rotors. Refer to Rear Brake Rotor Replacement in Disc Brakes.
  39. Install the brake calipers. Refer to Rear Brake Caliper Replacement in Disc Brakes.
  40. Install the tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  41. Fill the axle with axle lubricant. Use the proper fluid. Refer to Rear Axle Lubricant Replacement .
  42. Lower the vehicle.