GMC 15951978 Rear Lower Suspension Control Arm Assembly

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To remove the trailing arm, start by loosening the wheel lug nuts and raising the vehicle on jackstands. Support it securely and block the front wheels. Remove the wheel and detach the ABS wheel speed sensor harness clips from the trailing arm. Use a floor jack to support the lower control arm and remove the trailing arm-to-knuckle nut and bolt. Make an alignment mark on the trailing arm adjuster cam to the subframe. Hold the adjuster cam bolt with a wrench and unscrew the nut. Remove the nut and cam, then remove the pivot bolt. Finally, remove the trailing arm from the knuckle and subframe.

To remove the control arm, start by loosening the wheel lug nuts and raising the front of the vehicle on jackstands. Remove the wheel and disconnect the tie-rod end from the steering knuckle. Loosen the balljoint nut and use a puller to separate the balljoint from the steering knuckle. Remove the front bushing nut and the control arm pivot bolt nut, then detach the control arm from the sub-frame. Inspect the control arm for distortion and the bushings for wear, replacing any damaged parts. To install the control arm, reverse the removal steps, making sure to leave the pivot bolt nut and front bushing nut finger tight until all other components are installed. Before tightening the pivot nuts, raise the outer end of the control arm to simulate normal ride height and then tighten the nuts to the proper torque specifications. Finally, have the front wheel alignment checked and adjusted if necessary.

To remove the control arm, start by loosening the wheel lug nuts and raising the front of the vehicle on jackstands. Remove the wheel and disconnect the tie-rod end from the steering knuckle. Loosen the balljoint nut and use a puller to separate the balljoint from the steering knuckle. Remove the front bushing nut and the control arm pivot bolt nut, then detach the control arm from the sub-frame.

Remove the rear shock absorber and the adjuster link-to-knuckle nut. Make an alignment mark on the adjuster link adjuster cam to the subframe. Hold the adjuster cam bolt with a wrench and unscrew the nut. Remove the nut and cam, then remove the pivot bolt. Remove the adjuster link from the knuckle and subframe.

Remove the upper control arm-to-knuckle nut and bolt. Make an alignment mark on the upper control arm adjuster cam to the subframe. Hold the adjuster cam bolt with a wrench and unscrew the nut. Remove the nut and cam, the pivot bolt, and then the upper control arm from the knuckle and subframe.

To install the control arm, you need to reverse the removal steps. Make sure to leave the pivot bolt nut and front bushing nut finger tight until all other components are installed.