GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 1999 🢒 Isuzu MD Steel Tilt (F Model) 🢒 Driveline/Axle 🢒 Rear Drive Axle 🢒 Differential Replacement

Removal Procedure
  1. Inspect the rear axle housing for leaks and damage.
  2. Clean the rear axle housing with steam.

    3. Important: Shift the two speed rear axle into LOW range, if equipped.

  3. Apply the parking brake.
  4. Block the wheels.
  5. Remove the rear axle housing drain plug. Refer to Lubricant Change .
  6. Remove the propeller shaft. Refer to the following list in order to select the correct replacement procedure:
    7. • Propeller Shaft Replacement - One Piece - Flange Type
    • Propeller Shaft Replacement - Two Piece - Flange Type
    • Propeller Shaft Replacement - Two Piece - Yoke Type
    • Propeller Shaft Replacement - Three Piece - Flange Type
    • Propeller Shaft Replacement - Three Piece - Yoke Type
    • Propeller Shaft Replacement - Tandem Axle

    Object Number: 198566 Size: SH
  7. Remove the differential carrier assembly.
    8. 7.1. Support and secure the differential carrier to a floor jack.
    7.2. Remove the top two fasteners.
  8. Clean the rear axle housing and the differential carrier mating surfaces.
  9. Clean the rear axle housing bowl interior.
  10. Dry the rear axle housing bowl immediately using clean cloths. Then dry the rear axle housing bowl using compressed air.
  11. Inspect the rear axle housing for the following conditions:
    12. • Cracks
    • Loose studs
    • Nicks
    • Burrs

Installation Procedure

    Object Number: 198568 Size: SH

    Important: 

       • Apply a 3.17 mm (0.125 in) diameter bead completely around the rear axle housing differential carrier mating surface and around each threaded hole and stud.
       •  Install the differential carrier and fasteners within 20 minutes (before the silicone sealer sets).

  1. Install the Silicone Sealer (RTV).
  2. Install the four temporary alignment studs, if needed.
  3. Install the differential carrier.

    4. 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.

    Important: 

       • Ensure that the threads are clean and free of grease.
       • Apply 272 Threadlocker GM P/N 12345493 or equivalent to the threads of each differential carrier bolt.

  4. Install the following components to the differential carrier:
    5. • The washers
    • The bolts
    • The nuts, if equipped

    Tighten
    Tighten the differential carrier bolts and nuts to the torques listed in Fastener Tightening Specifications.

  5. Install the propeller shaft. Refer to the following list in order to select the correct replacement procedure:
    6. • Propeller Shaft Replacement - One Piece - Flange Type
    • Propeller Shaft Replacement - Two Piece - Flange Type
    • Propeller Shaft Replacement - Two Piece - Yoke Type
    • Propeller Shaft Replacement - Three Piece - Flange Type
    • Propeller Shaft Replacement - Three Piece - Yoke Type
    • Propeller Shaft Replacement - Tandem Axle
  6. Install the shift motor assembly, if equipped.
  7. Install the rear axle shafts.
  8. Install the rear axle lubricant. Refer to Lubricant Change .
  9. Remove the wheel blocks.