GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

J 39446 ABS Exciter Ring Protector Kit

  1. Remove the rear tire and wheel. Refer to Wheel Removal
  2. Remove the rear brake rotor. Refer to Brake Rotor Replacement
  3. Remove the rear axle housing cover.
  4. Refer to Rear Axle Housing Cover and Gasket Replacement


    Object Number: 164023  Size: SH
  5. Install a J 39446 onto the speed sensor reluctor wheel (6) on vehicles that are equipped with non-traction control axles.
  6. Remove the pinion gear shaft lock bolt/screw (5) from the differential case.
  7. Remove the pinion gear shaft (8) from the differential case (9).
  8. Refer to

    Rear Axle With Antilock Brake System and Differential Assembly


    Object Number: 180423  Size: MF
    (1)Differential Bearing Shim
    (2)Differential Bearing Spacer
    (3)Differential Bearing
    (4)Differential Carrier Bearing Cap
    (5)Differential Carrier Bearing Cap Bolt/Screw
    (6)Differential Ring Gear
    (7)Differential Pinion Gear Shaft Lock Bolt/Screw
    (8)Differential Pinion Gear Shaft
    (9)Differential Case
    (10)Front Differential Side Gear Thrust Washer
    (11)Differential Pinion Gear
    (12)Differential Pinion Thrust Washer
    (13)Differential Ring Gear Bolt/Screw
    (14)Rear Wheel Speed Sensor Reluctor Wheel
    or

    Rear Axle With Antilock Brake and Traction Control Systems Differential Assembly


    Object Number: 180432  Size: MF
    (1)Differential Bearing Shim
    (2)Differential Bearing Spacer
    (3)Differential Bearing
    (4)Differential Carrier Bearing Cap
    (5)Differential Carrier Bearing Cap Bolt/Screw
    (6)Differential Ring Gear
    (7)Differential Pinion Gear Shaft Lock Bolt/Screw
    (8)Differential Pinion Gear Shaft
    (9)Differential Case
    (10)Front Differential Side Gear Thrust Washer
    (11)Differential Pinion Gear
    (12)Differential Pinion Thrust Washer
    (13)Differential Ring Gear Bolt/Screw
    .

  9. Push the flanged end of the axle shaft into the rear axle housing (7) in order to access the rear axle shaft lock.
  10. Remove the rear axle shaft lock (1).

    Important: Do not damage the rear wheel speed sensor reluctor wheel (30) during axle shaft removal on vehicles that are equipped with traction control.

    The rear wheel speed sensor reluctor wheel is located on the axle shaft (29).

    If the rear wheel speed sensor reluctor wheel is damaged, replace the rear axle shaft.

  11. Remove the rear axle shaft (27 or 29) from the rear axle housing (10).
  12. Refer to

    Rear Axle With Antilock Brake System (Drum Brakes)


    Object Number: 180427  Size: LF
    (1)Differential Drive Pinion Gear Nut
    (2)Differential Drive Pinion Gear Washer
    (3)Differential Drive Pinion Gear Yoke
    (5)Differential Drive Pinion Gear Dirt Deflector
    (6)Differential Drive Pinion Gear Seal
    (7)Differential Drive Pinion Gear Outer Bearing
    (8)Differential Drive Pinion Gear Bearing Spacer
    (9)Rear Axle Housing Drain Plug
    (10)Rear Axle Housing
    (11)Rear Axle Vent
    (12)Wheel Speed Sensor
    (13)Rear Wheel Speed Sensor Bolt/Screw
    (14)Differential Drive Pinion Gear Inner Bearing
    (15)Differential Drive Pinion Gear Shim
    (16)Differential Drive Pinion Gear
    (17)Rear Axle Housing Cover Gasket
    (18)Rear Axle Housing Chip Collector Magnet
    (19)Rear Axle Housing Cover
    (20)Rear Axle Housing Cover Bolt/Screw
    (21)Rear Brake Backing Plate Nut
    (22)Rear Wheel Bearing
    (23)Rear Wheel Bearing Seal
    (24)Rear Brake Backing Plate
    (25)Rear Brake Backing Plate Bolt/Screw
    (26)Rear Axle Shaft Lock
    (27)Rear Axle Shaft
    (28)Rear Wheel Bolt
    (29)Rear Brake
    (30)Rear Brake Drum
    or

    Rear Axle With Antilock Brake and Traction Control Systems


    Object Number: 180429  Size: LF
    (1)Differential Drive Pinion Gear Nut
    (2)Differential Drive Pinion Gear Washer
    (3)Differential Drive Pinion Gear Yoke
    (5)Differential Drive Pinion Gear Dirt Deflector
    (6)Differential Drive Pinion Gear Seal
    (7)Differential Drive Pinion Gear Outer Bearing
    (8)Differential Drive Pinion Gear Bearing Spacer
    (9)Rear Axle Housing Drain Plug
    (10)Rear Axle Housing
    (11)Rear Axle Vent
    (12)Differential Drive Pinion Gear Inner Bearing
    (13)Differential Drive Pinion Gear Shim
    (14)Differential Drive Pinion Gear
    (15)Rear Axle Housing Cover Gasket
    (16)Rear Axle Housing Chip Collector Magnet
    (17)Rear Axle Housing Cover
    (18)Rear Axle Housing Cover Bolt/Screw
    (19)Rear Brake Backing Plate Nut
    (20)Rear Wheel Bearing
    (21)Rear Wheel Bearing Seal
    (22)Rear Axle Tube Flange Shim
    (23)Rear Brake Caliper Bolt/Screw
    (24)Rear Brake Caliper Mounting Plate
    (25)Rear Brake Caliper Mounting Plate Bolt/Screw
    (26)Wheel Speed Sensor
    (27)Rear Brake Caliper
    (28)Rear Axle Shaft Lock
    (29)Rear Axle Shaft
    (30)Rear Wheel Speed Sensor Reluctor Wheel
    (31)Rear Wheel Bolt
    (32)Rear Brake Rotor
    .

Installation Procedure

  1. Install the rear axle shaft (27 or 29) into place.
  2. Ensure that the following conditions are met:

    • The splines on the end of the axle shaft (27 or 29) do not damage the rear wheel bearing seal (23 or 21).
    • The splines on the end of the axle shaft (27 or 29) engage with splines of the differential side gear (11).
    • Refer to

    Rear Axle With Antilock Brake System and Differential Assembly


    Object Number: 180423  Size: MF
    (1)Differential Bearing Shim
    (2)Differential Bearing Spacer
    (3)Differential Bearing
    (4)Differential Carrier Bearing Cap
    (5)Differential Carrier Bearing Cap Bolt/Screw
    (6)Differential Ring Gear
    (7)Differential Pinion Gear Shaft Lock Bolt/Screw
    (8)Differential Pinion Gear Shaft
    (9)Differential Case
    (10)Front Differential Side Gear Thrust Washer
    (11)Differential Pinion Gear
    (12)Differential Pinion Thrust Washer
    (13)Differential Ring Gear Bolt/Screw
    (14)Rear Wheel Speed Sensor Reluctor Wheel
    or

    Rear Axle With Antilock Brake and Traction Control Systems Differential Assembly


    Object Number: 180432  Size: MF
    (1)Differential Bearing Shim
    (2)Differential Bearing Spacer
    (3)Differential Bearing
    (4)Differential Carrier Bearing Cap
    (5)Differential Carrier Bearing Cap Bolt/Screw
    (6)Differential Ring Gear
    (7)Differential Pinion Gear Shaft Lock Bolt/Screw
    (8)Differential Pinion Gear Shaft
    (9)Differential Case
    (10)Front Differential Side Gear Thrust Washer
    (11)Differential Pinion Gear
    (12)Differential Pinion Thrust Washer
    (13)Differential Ring Gear Bolt/Screw
    .

    Object Number: 164023  Size: SH
  3. Install the rear axle shaft lock (1).
  4. Push the axle shaft (27 or 29) outward so that the rear axle shaft lock seats in the counterbore of the differential side gear.

    Refer to

    Rear Axle With Antilock Brake System (Drum Brakes)


    Object Number: 180427  Size: LF
    (1)Differential Drive Pinion Gear Nut
    (2)Differential Drive Pinion Gear Washer
    (3)Differential Drive Pinion Gear Yoke
    (5)Differential Drive Pinion Gear Dirt Deflector
    (6)Differential Drive Pinion Gear Seal
    (7)Differential Drive Pinion Gear Outer Bearing
    (8)Differential Drive Pinion Gear Bearing Spacer
    (9)Rear Axle Housing Drain Plug
    (10)Rear Axle Housing
    (11)Rear Axle Vent
    (12)Wheel Speed Sensor
    (13)Rear Wheel Speed Sensor Bolt/Screw
    (14)Differential Drive Pinion Gear Inner Bearing
    (15)Differential Drive Pinion Gear Shim
    (16)Differential Drive Pinion Gear
    (17)Rear Axle Housing Cover Gasket
    (18)Rear Axle Housing Chip Collector Magnet
    (19)Rear Axle Housing Cover
    (20)Rear Axle Housing Cover Bolt/Screw
    (21)Rear Brake Backing Plate Nut
    (22)Rear Wheel Bearing
    (23)Rear Wheel Bearing Seal
    (24)Rear Brake Backing Plate
    (25)Rear Brake Backing Plate Bolt/Screw
    (26)Rear Axle Shaft Lock
    (27)Rear Axle Shaft
    (28)Rear Wheel Bolt
    (29)Rear Brake
    (30)Rear Brake Drum
    or

    Rear Axle With Antilock Brake and Traction Control Systems


    Object Number: 180429  Size: LF
    (1)Differential Drive Pinion Gear Nut
    (2)Differential Drive Pinion Gear Washer
    (3)Differential Drive Pinion Gear Yoke
    (5)Differential Drive Pinion Gear Dirt Deflector
    (6)Differential Drive Pinion Gear Seal
    (7)Differential Drive Pinion Gear Outer Bearing
    (8)Differential Drive Pinion Gear Bearing Spacer
    (9)Rear Axle Housing Drain Plug
    (10)Rear Axle Housing
    (11)Rear Axle Vent
    (12)Differential Drive Pinion Gear Inner Bearing
    (13)Differential Drive Pinion Gear Shim
    (14)Differential Drive Pinion Gear
    (15)Rear Axle Housing Cover Gasket
    (16)Rear Axle Housing Chip Collector Magnet
    (17)Rear Axle Housing Cover
    (18)Rear Axle Housing Cover Bolt/Screw
    (19)Rear Brake Backing Plate Nut
    (20)Rear Wheel Bearing
    (21)Rear Wheel Bearing Seal
    (22)Rear Axle Tube Flange Shim
    (23)Rear Brake Caliper Bolt/Screw
    (24)Rear Brake Caliper Mounting Plate
    (25)Rear Brake Caliper Mounting Plate Bolt/Screw
    (26)Wheel Speed Sensor
    (27)Rear Brake Caliper
    (28)Rear Axle Shaft Lock
    (29)Rear Axle Shaft
    (30)Rear Wheel Speed Sensor Reluctor Wheel
    (31)Rear Wheel Bolt
    (32)Rear Brake Rotor

  5. Install the pinion gear shaft (8) through the following components:
  6. • The differential case (9)
    • The pinion gear thrust washers (12)
    • The pinion gears (11)
    • Align the hole in the pinion gear shaft (8) with the rear axle shaft lock bolt/screw hole in the differential case (9).
    • Refer to

    Rear Axle With Antilock Brake System and Differential Assembly


    Object Number: 180423  Size: MF
    (1)Differential Bearing Shim
    (2)Differential Bearing Spacer
    (3)Differential Bearing
    (4)Differential Carrier Bearing Cap
    (5)Differential Carrier Bearing Cap Bolt/Screw
    (6)Differential Ring Gear
    (7)Differential Pinion Gear Shaft Lock Bolt/Screw
    (8)Differential Pinion Gear Shaft
    (9)Differential Case
    (10)Front Differential Side Gear Thrust Washer
    (11)Differential Pinion Gear
    (12)Differential Pinion Thrust Washer
    (13)Differential Ring Gear Bolt/Screw
    (14)Rear Wheel Speed Sensor Reluctor Wheel
    or

    Rear Axle With Antilock Brake and Traction Control Systems Differential Assembly


    Object Number: 180432  Size: MF
    (1)Differential Bearing Shim
    (2)Differential Bearing Spacer
    (3)Differential Bearing
    (4)Differential Carrier Bearing Cap
    (5)Differential Carrier Bearing Cap Bolt/Screw
    (6)Differential Ring Gear
    (7)Differential Pinion Gear Shaft Lock Bolt/Screw
    (8)Differential Pinion Gear Shaft
    (9)Differential Case
    (10)Front Differential Side Gear Thrust Washer
    (11)Differential Pinion Gear
    (12)Differential Pinion Thrust Washer
    (13)Differential Ring Gear Bolt/Screw
    .

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Coat the pinion gear shaft lock bolt/screw (5) with Loctite 242 or an equivalent.
  8. Install the pinion gear shaft lock bolt/screw (5).

    Tighten
    Tighten the differential pinion gear shaft lock bolt/screw (5) to 36 N·m (27 lb ft).

  9. Remove the J 39446 from the speed sensor reluctor wheel (6) if the vehicle has a standard rear axle.
  10. If a new speed sensor reluctor wheel (6) was installed, remove and discard the plastic covering.

  11. Install the rear axle housing cover.
  12. Refer to Rear Axle Housing Cover and Gasket Replacement .

  13. Install the rear brake rotor. Refer to Brake Rotor Replacement
  14. Install the rear tire and the rear wheel. Refer to Wheel Removal