Roadmaster 1992

Control Arms

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Removal & Installation



Lower Control Arm

At this time the manufacturer does not provide removal and installation procedures for this component. The following procedure is a guideline and may differ from the vehicle you are servicing.


NOTE
If both control arms are being replaced, replace one side at a time to prevent the axle from rolling or slipping sideways as this might occur with both control arms removed. Neither front or rear lower control arm bushings are serviceable.

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    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.


    NOTE
    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.


    NOTE
    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.

  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and support the vehicle safely.
  6.  
  7. Remove/disconnect the stabilizer shaft bracket to the lower control arm.
  8.  
  9. Disconnect the rear wheel speed sensor harness from the lower control arm.
  10.  
  11. Remove the front and rear lower control arm nuts.
  12.  
  13. Position a suitable jack under the rear axle, raise the jack to relieve tension on the lower control arm bolts.
  14.  
  15. Lower the control arm bolts and remove the arm.

    Click image to see an enlarged view

    Fig. Rear lower control arm and related components

  16.  

To install:


NOTE
Be sure to use new fasteners, as required.


NOTE
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.
  2.  
  3. Slide the control arm into position with the stabilizer shaft attaching holes toward the rear of the frame. Install the front bolt from the outboard side and the rear bolt from the inboard side. Adjust the jack under the rear axle as necessary to install the bolts.
  4.  
  5. Tighten the stabilizer bracket to lower control arm bolts to 21 ft. lbs.
  6.  
  7. Tighten the lower control arm nuts to 122 ft. lbs.
    NOTE
    Pivot bolts in the control arms must always be torqued when the arms are in the vehicles normal standing height position. If not the ride rate may be adversely affected.

  8.  
  9. 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.
  10.  

Upper Control Arm

At this time the manufacturer does not provide removal and installation procedures for this component. The following procedure is a guideline and may differ from the vehicle you are servicing.


NOTE
If both control arms are being replaced, replace one side at a time to prevent the axle from rolling or slipping sideways as this might occur with both control arms removed. Neither front or rear lower control arm bushings are serviceable.

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    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.


    NOTE
    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.


    NOTE
    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.

  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and support the vehicle safely.
  6.  
  7. If equipped with ELC, remove the retaining nut that secures the height sensor link to the right upper control arm.
  8.  
  9. Properly position jack stands under the rear axle assembly.
  10.  
  11. Remove/disconnect the control arm pivot bolts.
  12.  
  13. Remove the control arm from its mounting.

    Click image to see an enlarged view

    Fig. Rear upper control arm and related components

  14.  

To install:


NOTE
Be sure to use new fasteners, as required.


NOTE
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.
  2.  
  3. Slide the control arm into position with the stabilizer shaft attaching holes toward the rear of the frame. Install the front bolt from the outboard side and the rear bolt from the inboard side. Adjust the jack under the rear axle as necessary to install the bolts.
  4.  
  5. Loosely install the front pivot bolt and nut. Loosely install the rear pivot bolt and nut.
  6.  
  7. Lower the vehicle.
  8.  
  9. Tighten the control arm to frame nut to 122 ft. lbs.
  10.  
  11. Tighten the control arm to axle nut to 70 ft. lbs.
    NOTE
    Pivot bolts in the control arms must always be torqued when the arms are in the vehicles normal standing height position. If not the ride rate may be adversely affected.

  12.  
  13. 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.
  14.  

 
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