GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 Envoy - 4WD 🢒 Bulletins 🢒 SMU - Revised Differential Carrier Assembly Replacement

SMU - Revised Differential Carrier Assembly Replacement

Subject:Revised Differential Carrier Assembly Replacement

Models:2002 Chevrolet TrailBlazer
2002 GMC Envoy
2002 Oldsmobile Bravada


This bulletin is being issued to revise the Differential Carrier Assembly Replacement Procedure in the Front Drive Axle sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.

Removal Procedure


    Object Number: 656803 Size: SH
  1. Remove the front tires and wheels. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.

    2. Object Number: 687450 Size: SH
  2. Remove the engine protection shield. Refer to Engine Protection Shield Replacement in Frame and Underbody.
  3. Drain the engine of oil.
  4. Drain the front drive axle. Refer to Lubricant Change.
  5. Remove the front propeller shaft from the front axle.
  6. Wrap the bearing caps with tape in order to prevent the loss of the roller bearings.

    7. Object Number: 886518 Size: MH
  7. Remove the ABS wiring harness from the retainers.

    8. Object Number: 886462 Size: SH
  8. Remove the brake hose retaining bolts.
  9. Remove the front drive axle vent hose.

    10. Object Number: 731542 Size: SH
  10. Remove the left and right upper ball pinch bolt and nut.

    11. Object Number: 886764 Size: SH
  11. Remove the left and right upper shock module retaining nuts.

    12. Object Number: 731562 Size: SH
  12. Remove the front stabilizer bar links from the frame. Refer to Stabilizer Shaft Link Replacement in Front Suspension.
  13. Remove the shock module from the frame.
  14. Remove the steering knuckle from the upper control arm.
  15. Remove the left and right front wheel drive shafts from the front drive axle.

    16. Object Number: 887945 Size: SH
  16. Relocate and secure the left and right front wheel drive shafts to the frame.

    17. Object Number: 887942 Size: SH
  17. Using mechanics wire or hook, support the front shock modules and steering knuckle.

    18. Object Number: 687447 Size: SH
  18. Remove the power steering gear assembly. Refer to Power Steering Gear Replacement in Power Steering System.

    19. Object Number: 756293 Size: SH
  19. Remove the inner shaft from the front drive axle. Refer to Inner Axle Shaft Replacement-Front Drive Axle.

    20. Object Number: 893104 Size: SH
  20. Remove the front drive axle from the oil pan.
  21. Secure the front drive axle to the frame.
  22. Remove the oil pan. Refer to Oil Pan Replacement in 4.2L Engine Mechanical.

    23. Object Number: 893108 Size: SH
  23. Remove the front drive axle from the vehicle.

Installation Procedure


    Object Number: 893104 Size: SH
  1. Install the front drive axle to the frame.
  2. Secure the front drive axle to the frame.
  3. Install the oil pan. Refer to Oil Pan Replacement in 4.2L Engine Mechanical.
  4. Remove the front drive axle from the frame.
  5. Install the front drive axle to the oil pan.

    6. Notice: Refer to Fastener Notice in Cautions and Notices.

  6. Install the front drive axle mounting bolts.

    7. Tighten
    Tighten the front drive axle mounting bolts to 85 N·m (63 lb ft).


    Object Number: 756293 Size: SH
  7. Install the inner axle to the front drive axle. Refer to Inner Axle Shaft Replacement-Front Drive Axle.

    8. Object Number: 687447 Size: SH
  8. Install the power steering gear. Refer to Power Steering Gear Replacement in Power Steering System.
  9. Remove the left and right front wheel drive shafts from the frame.
  10. Remove the left, right shock module and steering knuckles from their supports.
  11. Install the right and left front wheel drive shafts to the front drive axle.
  12. Install the vent hose to the front drive axle.
  13. Install the left and right shock modules to the frame.
  14. Install the upper shock module retaining nuts.

    15. Tighten
    Tighten the upper shock module mounting bolts to 100 N·m (74 lb ft).

  15. Install the steering knuckle to the upper control arm.
  16. Install the upper ball joint pinch bolt and nut.

    17. Tighten
    Tighten the upper shock module mounting bolts to 40 N·m (30 lb ft).


    Object Number: 731562 Size: SH
  17. Install the front stabilizer bar links to the frame. Refer to Stabilizer Shaft Link Replacement in Front Suspension.

    18. Object Number: 886462 Size: SH
  18. Install the brake hose retaining bolts.

    19. Tighten
    Tighten the brake hose retaining bolt to 25 N·m (18 lb ft).


    Object Number: 886518 Size: MH
  19. Install the right and left ABS wiring harness in the retainers.
  20. Fill the front drive axle with the proper fluid. Refer to Lubricant Change.
  21. Fill the engine with the proper amount motor oil. Refer to Capacities-Approximate Fluid in Maintenance and Lubrication.

    22. Object Number: 687450 Size: SH
  22. Install the engine protection shield. Refer to Engine Protection Shield Replacement in Frame and Underbody.

    23. Object Number: 656803 Size: SH
  23. Install the tires and wheels. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.