Roadmaster 1992

Axle Housing


Removal & Installation

  1. Before servicing the vehicle, refer to the Precautions Section.
    Disconnecting the negative battery cable on some vehicles may interfere with the functions of the on-board computer systems and may require the computer to undergo a relearning process, once the negative battery cable is reconnected.

    If working near and/or around the SRS system and components, be sure to properly disable the SRS system. See disarming/arming the SRS system.

    For vehicles equipped with OnStar (RPO UE1), with battery backup, the backup battery is a redundant power supply to allow limited ONStar functionality in the event of a main battery power disruption to the OnStar module (VCIM). Do not disconnect the main vehicle battery or remove the OnStar fuse with the ignition key in any position other than OFF. Retained accessory power should be allowed to time out or be disabled by opening the driver-s side door before disconnecting power. Disconnecting power to the module in any way while the ignition is ON or with the retained accessory power activated may cause activation of the OnStar backup battery system and will discharge and permanently damage the backup battery. Once the backup battery is activated it will stay on until it has completely discharged. The backup battery is not rechargeable and once it is activated, it must be replaced.

  3. Disconnect the negative battery cable.
  5. Raise and safely support the vehicle.
  7. Remove the tire and wheel assemblies.
  9. Properly support the rear axle.
  11. Matchmark and remove the driveshaft.
  13. Remove the wheel speed sensors from the axle housing.

    Click image to see an enlarged view

    Fig. Rear wheel speed sensor mounting

  15. Right and left cables from the equalizer.
  17. Remove the shock absorbers.
  19. Disconnect the brake line junction block bolt at the housing.
  21. Disconnect the brake lines at the junction block.
    Be sure to position a catch pan under this component to catch brake fluid. Be sure to properly dispose of brake fluid.

  23. Disconnect/remove the upper control arms from the housing.
  25. Carefully lower the rear axle assembly.
  27. Carefully remove the rear springs.
  29. As required remove the brake drums, housing cover, axle shaft, brake lines from the axle housing clips and backing plates.
  31. Remove/disconnect the lower control arms from the housing.
  33. Remove the axle housing.

    Click image to see an enlarged view

    Fig. Rear axle removal points

    Click image to see an enlarged view

    Fig. Rear axle and related components


To install:

Be sure to use new fasteners, as required.

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 sealer are identified. 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.

  1. Installation is the reverse of the removal procedure.
  3. Using the GM diagnostic scan tool or aftermarket equivalent reprogram the necessary systems and components. Be sure to follow the scan tool manufacturer-s directions.