GM Full-Size Trucks 1988-1998 Repair Information

Upper Control Arm-R-Series



See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the upper control arm-R-Series

  1. Raise and support the truck on jackstands.
  3. Support the lower control arm with a floor jack.
  5. Remove the wheel.
  7. Remove the cotter pin from the upper control arm ball stud and loosen the stud nut until the bottom surface of the nut is slightly below the end of the stud.
  9. Install a spring compressor on the coil spring for safety.
  11. Loosen the upper control arm ball stud in the steering knuckle using a ball joint stud removal tool. Remove the nut from the ball stud and raise the upper arm to clear the steering knuckle. It may be necessary to remove the brake caliper and wire it to the frame to gain clearance. Do not allow the caliper to hang by the brake hose.
  13. Remove the nuts securing the control arm shaft studs to the crossmember bracket and remove the control arm.
  15. Tape the shims and spacers together and tag for proper reassembly.

To install:

Installation is the reverse of removal but please note the following important steps.

  1. Place the control arm in position and install the nuts. Before tightening the nuts, insert the caster and camber shims in the same order as when installed.
  3. Tighten the nuts securing the control arm shaft studs-to-crossmember bracket to 70 ft. lbs. (95 Nm) for 10/1500 and 20/2500 series; 105 ft. lbs. (142 Nm) for 30/3500 series.
  5. Tighten the ball stud nut to 90 ft. lbs. (122 Nm) for 10/1500 series and 20/2500 series; 130 ft. lbs. (176 Nm) for 30/3500 series. Install the cotter pin. Never back off the nut to install the cotter pin. Always advance it.