GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 44414 Pinion Seal Installer
    • J 22912-B Split Plate Bearing Puller
    • J 24433 Pinion Cone and Side Bearing Installer
    • J 37624 Pinon Bearing Installer
    • J 8092 Universal Driver Handle ¾ in-10
    • J 8608 Rear Pinion Bearing Race Installer
    • J 8614-01 Flange and Pulley Holding Tool

Removal Procedure

    Important: Observe and mark the positions of all the driveline components, relative to the propeller shaft and the axles, prior to disassembly. These components include the propeller shafts, drive axles, pinion flanges, output shafts, etc. Reassemble all the components in the exact places in which you removed the parts. Follow any specifications, torque values, and any measurements made prior to disassembly.

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Drain the axle lubricant. Refer to Lubricant Change .
  3. Remove the axle shafts. Refer to Rear Axle Shaft and/or Gasket Replacement .
  4. Remove the propeller shaft from the rear axle pinion yoke or to the yoke flange. Refer to One-Piece Propeller Shaft Replacement or Two-Piece Propeller Shaft Replacement in Propeller Shaft.

  5. Object Number: 661077  Size: SH
  6. Measure the amount of torque required to rotate the pinion and the ring gear. Use an inch-pound torque wrench. Record this measurement for reassembly. This will give the combined preload for the following components:
  7. • The pinion bearings
    • The pinion pilot bearing
    • The pinion oil seal
    • The differential case bearings

    Object Number: 788905  Size: SH
  8. Place an alignment mark between the drive pinion and the pinion yoke.
  9. Remove the pinion gear bearing retainer bolts.
  10. Remove the pinion gear bearing retainer and the pinion.
  11. Remove the selective shim.
  12. Measure the amount of torque required to rotate the pinion. Use an inch-pound torque wrench. Record this measurement for reassembly.

  13. Object Number: 694814  Size: SH
  14. Install the J 8614-01 as shown.
  15. Remove the pinion nut while holding the J 8614-01 .
  16. Remove the washer.

  17. Object Number: 694825  Size: SH
  18. Install the J 8614-2 (2) and the J 8614-3 (1) into the J 8614-01 (3) as shown.
  19. Remove the pinion yoke by turning the J 8614-3 (1) clockwise while holding the J 8614-01 (3).
  20. Remove the pinion oil seal.
  21. Use a suitable seal removal tool. Do not damage the housing.

  22. Remove the outer pinion bearing.

  23. Object Number: 694822  Size: SH
  24. Remove the pinion.

  25. Object Number: 739955  Size: SH
  26. Remove the collapsible spacer.

  27. Object Number: 680110  Size: SH
  28. Remove the inner pinion bearing from the pinion using the J 22912-B and a hydraulic press.

  29. Object Number: 739944  Size: SH
  30. Remove the outer pinion bearing cup using a hammer and a brass drift in the slots provided.
  31. Move the drift back and forth between one side of the cup and the other in order to work the cups out of the retainer evenly.


    Object Number: 739945  Size: SH
  32. Remove the inner pinion bearing cup using a hammer and a brass drift in the slots provided.
  33. Move the drift back and forth between one side of the cup and the other in order to work the cups out of the retainer evenly.

Installation Procedure


    Object Number: 739952  Size: SH
  1. Install the inner pinion bearing cup into the pinion gear bearing retainer using the J 37624  (2) and the J 8092  (1).

  2. Object Number: 739946  Size: SH
  3. Install the outer pinion bearing cup into the pinion gear bearing retainer using the J 8608  (2) and the J 8092  (1).

  4. Object Number: 739953  Size: SH
  5. Install the inner pinion bearing using the J 24433 .
  6. Press the bearing on until the cone seats on the pinion.

  7. Install a new collapsible spacer.
  8. Lubricate the pinion bearings with axle lubricant. Use the proper fluid. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.

  9. Object Number: 739961  Size: SH
  10. Install the pinion into the pinion gear bearing retainer.
  11. Install the outer pinion bearing onto the pinion.

  12. Object Number: 739948  Size: SH
  13. Install a new pinion oil seal using the J 44414 .
  14. Apply sealant, GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the splines of the pinion yoke.

  15. Object Number: 788905  Size: SH
  16. Install the pinion yoke.
  17. Align the marks made during removal.

    Notice: Refer to Pinion Flange/Yoke Installation Notice in the Preface section.

  18. 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.
  19. Install the washer and a new pinion nut.

  20. Object Number: 694814  Size: SH
  21. Install the J 8614-01 onto the pinion yoke as shown.
  22. Notice: Refer to Fastener Notice in the Preface section.

    Important: If the rotating torque is exceeded, the pinion will have to be removed and a new collapsible spacer installed.

  23. Tighten the pinion nut while holding the J 8614-01 .
  24. Tighten
    Tighten the 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
  25. Measure the rotating torque of the pinion. Compare this measurement with the rotating torque recorded during removal.
  26. Tighten
    Tighten the nut in small increments, as needed, until the rotating torque is 0.40-0.57 N·m (3-5 lb in) greater than the rotating torque recorded during removal.

  27. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the rotating torque and adjust if necessary.
  28. Determine the selective shim thickness for the pinion gear bearing retainer. Refer to Pinion Depth Adjustment .

  29. Object Number: 739959  Size: SH
  30. Apply sealant, GM P/N 1052942 (Canadian P/N 10953466) or equivalent, to sealing surface of the pinion gear bearing retainer.
  31. Install the selective shim.
  32. Align the tab on the shim with the unmachined surface of the pinion gear bearing retainer.

  33. Apply sealant, GM P/N 1052942 (Canadian P/N 10953466) or equivalent, to surface of the selective shim.
  34. Install the pinion gear bearing retainer.
  35. Install the pinion gear bearing retainer bolts.
  36. Tighten
    Tighten the pinion gear bearing retainer bolts to 88 N·m (65 lb ft).


    Object Number: 694807  Size: SH
  37. Measure the rotating torque of the pinion and the ring gear. Compare this measurement with the rotating torque recorded during removal.
  38. Specification
    The rotating torque of the pinion and the ring gear should be between 3.9-6.2 N·m (30-55 lb in) for new bearings or 2.8-5.6 N·m (25-50 lb in) for used bearings.

  39. If the rotating torque of the pinion and the ring gear is not within specifications, adjust the preload of the pinion or the differential side bearings as necessary.
  40. Install the propeller shaft to the rear axle pinion yoke or to the yoke flange. Refer to One-Piece Propeller Shaft Replacement or Two-Piece Propeller Shaft Replacement in Propeller Shaft.
  41. Install the axle shafts. Refer to Rear Axle Shaft and/or Gasket Replacement .
  42. Fill the axle with axle lubricant. Refer to Lubricant Change .
  43. Lower the vehicle.