GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 45677 Frame Mount Installer/Receiver, or equivalent

Removal Procedure

  1. Using a wheel lift hoist, raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

  2. Object Number: 797340  Size: SH
  3. Using utility stands (2), support some of the weight of the vehicle at the rear jacking points (1).

  4. Object Number: 797343  Size: SH
  5. Remove the rear shock absorbers. Refer to Shock Absorber Replacement .

  6. Object Number: 797341  Size: SH
  7. Remove the right hand brake cable (1) from the left guide loop (2).

  8. Object Number: 797665  Size: SH
  9. For all wheel drive, disconnect the electrical connector (1) from the rear differential clutch pump check valve (2).

  10. Object Number: 797350  Size: SH
  11. Remove both ABS wiring harnesses (1) from the frame rails.

  12. Object Number: 797348  Size: SH
  13. Remove the brake hose mounting bolts (1) from the body brackets (2). Refer to Rear Brake Hose Replacement in Hydraulic Brakes.

  14. Object Number: 797345  Size: SH
  15. Disconnect the automatic level control (ALC) height sensor (2) harness connector (1).
  16. Lower the rear wheel lift hoist to unload the suspension partially, letting the utility stands take some of the vehicle weight .

  17. Object Number: 797352  Size: SH
  18. Remove the rear crossmember mounting bolts (1). Refer to Crossmember Replacement .

  19. Object Number: 797392  Size: SH
  20. With the help from an assistant , lower and rotate back the rear crossmember (1), approximately 114 mm (4 1/2 in) at the front mount, to install bushing removal/installation tool.
  21. Remove the rear crossmember frame mounts using J 45677 or equivalent .

Installation Procedure

    Important: Identify the orientation of the voids in the mounts and install the mounts with the voids fore and aft to the vehicle.

  1. Install the new frame mounts using J 45677 or equivalent .

  2. Object Number: 797392  Size: SH
  3. With the help from an assistant, guide the rear crossmember (1) into place while the assistant raises the hoist.
  4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 797352  Size: SH
  5. Install the rear suspension crossmember mounting bolts (1). Refer to Crossmember Replacement .
  6. Tighten
    Tighten the bolts to 130 N·m (96 lb ft).


    Object Number: 797345  Size: SH
  7. Connect the ALC height sensor (2) harness connector (1).

  8. Object Number: 797350  Size: SH
  9. Install both ABS wiring harnesses (1) onto the frame rails.

  10. Object Number: 797665  Size: SH
  11. For all wheel drive, connect the electrical connector (1) into the rear differential clutch pump check valve (2).

  12. Object Number: 797341  Size: SH
  13. Install the right hand park brake cable (1) into the left guide loop (2).

  14. Object Number: 797348  Size: SH
  15. Install the brake hose mounting bolts (1) to the body brackets (2). Refer to Rear Brake Hose Replacement in Hydraulic Brakes.

  16. Object Number: 797343  Size: SH
  17. Install rear shock absorbers. Refer to Shock Absorber Replacement .

  18. Object Number: 797340  Size: SH
  19. Remove the utility stands (2).
  20. Lower the vehicle.
  21. Check the rear suspension toe alignment and adjust if necessary. Refer to Wheel Alignment Measurement in Wheel Alignment.