GM Service Manual Online
For 1990-2009 cars only

Important: 

   • If the same differential side gears and the thrust washers are being used, install the differential side gears and the thrust washers in their original locations.
   • The locking differential side gear and the differential side gear are not interchangeable. The side gears must be installed in the correct location in order for the locking differential to function properly.

  1. Measure the backlash of the pinion gears to differential side gear and locking differential side gear. Refer to Locking Differential Adjustment .

  2. Object Number: 851735  Size: SH
  3. Install the differential side gear thrust washer to the locking differential side gear.
  4. Install the locking differential side gear and thrust washer into the ring gear side of the differential case.

  5. Object Number: 851734  Size: SH
  6. Install the differential side gear thrust washer to the differential side gear.
  7. Install the differential side gear and thrust washer into the bell side of the differential case.

  8. Object Number: 851732  Size: SH
  9. Install the differential pinion gears and thrust washers by doing the following:
  10. 6.1. Position both pinion gears and thrust washers between the differential side gears.

    Place the pinion gears and thrust washers 180 degrees across from each other.

    6.2. Rotate the differential side gears until both pinion gears and thrust washers are directly opposite the opening in the differential case.

    Line up the pinion shaft opening in each of the pinion gears with the pinion shaft opening in the differential case.


    Object Number: 851733  Size: SH
  11. Install the pinion shaft.
  12. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 851727  Size: SH
  13. Install a new pinion shaft lock bolt.
  14. Tighten
    Tighten the new pinion shaft lock bolt to 50 N·m (37 lb ft).


    Object Number: 851701  Size: SH
  15. Install the locking differential clutch springs.

  16. Object Number: 851697  Size: SH
  17. Install the locking differential clutch spring retainer and the differential carrier lock pins.

  18. Object Number: 851654  Size: SH
  19. Install the inboard locking differential ball bearing plate.
  20. Place the inboard locking differential ball bearing plate on the three exposed differential clutch springs.


    Object Number: 851649  Size: SH
  21. Install the locking differential ball bearings.

  22. Object Number: 851645  Size: SH
  23. Install the outboard locking differential ball bearing plate.

  24. Object Number: 851641  Size: SH
  25. Install the locking differential coil plate.

  26. Object Number: 851633  Size: SH
  27. Install the locking differential coil assembly.
  28. Install the differential bearing race.

  29. Object Number: 851631  Size: SH

    Important: The differential bearing race must be compressed in order to install the differential bearing retainer.

  30. Install the differential bearing retainer by performing the following steps:
  31. 17.1. Install the differential bearing retainer.
    17.2. With the aid of an assistant, push the differential bearing race down towards the differential case in order to compress the differential bearing retainer and differential coil assembly against the locking differential coil plate.
    17.3. Install the differential bearing retainer.

    Ensure the differential bearing retainer is evenly and fully seated in the differential bearing retainer slot before releasing the differential bearing race.

  32. Install the ring gear. Refer to Drive Pinion and Ring Gear Replacement in Rear Drive Axle.
  33. Install the differential side bearings. Refer to Differential Side Bearings Replacement in Rear Drive Axle.