GM 20900531 Rear Upper Suspension Control Arm Assembly

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Disconnect the ABS wheel speed sensor if equipped, separate the ball joint from the steering knuckle, and remove the control arm-to-subframe fasteners.

Detach the hydraulic brake line from the top of the rear suspension support and place a floor jack beneath it.

To take off the upper trailing arm for any model, loosen lug nuts on wheels, lift up the vehicle and secure with jack stands. Pull out the bolt of the ABS wheel speed sensor harness from the trailing arm. Use a floor jack to brace the lower control arm and then unfasten nut as well as bolt leading into knuckle of upper trailing arm. Rear suspension models with RPO GNE should have their alignment marks created on an adjuster cam for upper trailing with respect to subframe prior to removal of nut and cam. Additionally remove pivot bolt. In contrast, cars that have been outfitted with GNC rear suspension must lose their inner pivot bolts for respective upper trailing arms. Upon removal, these are replaced in reverse order. Finally bring lower control arm back up to normal ride height and tighten fasteners accordingly according to torque specification supplied by manufacturer of your car.Use new fasteners during installation of RPO GNC rear suspension for upper trailing arm.Raise outer end of trailing arm using floor jack in order to attain normal ride height-tight all bolts according to torque specifications given by manufacturer.Install wheel and lug nuts; lower vehicle and tighten lug nuts (to specified torque). Check wheel alignment if necessary.Cut away coil spring first when removing lower run bar.For cars that come equipped with RPO GNE rear suspension remove shock absorber's bottom mounting bolt or make sure you mark the adjuster cam against the sub-frame in case it has RPO GNC rear suspension.Proceed by detaching said arms from sub-frame whereupon they can be removed after taking out their corresponding pivot bolts.Place trailing arm while simulating normal ride height near outer end using hoist.Raised outer end of running bar using jack stand making it appear like how it would be under normal operating conditions-Tighten every single nut having made reference to specifications furnished by automaker.Put wheels back onto vehicle; let down automobile onto pavement while observing correct torque for tightening lug nuts.Get wheel alignment checked. Remove the coil springs to take down trailing arm.Putting it in a different way, RPO GNE rear suspension will require one to eradicate shock absorbers by taking off its bottom mounting bolt or if it is powered by RPO GNC rear suspension, marking the adjuster cam on the sub-frame.Remove trailing arm subframe pivot bolts and detach arms from subframes-lift outer end of trailing arm with hoist in order to simulate normal ride height and tighten all bolts according to the required torque specifications.Installation of wheels and their fastening nuts should be done; vehicles lowered, while nuts are tightened at required degree.Remove lower link-to-knuckle bolt then remove links.Raise outer end of running bar using jack stand making it appear like how it would be under normal operating conditions-Tighten every single nut having made reference to specifications furnished by automaker.Put wheels back onto vehicle; let down automobile onto pavement while observing correct torque for tightening lug nuts.Check wheel alignment if necessary.

To replace the rear bushing, mount the control arm in a vise and remove the bushing-to-control arm bolt.

To install these components, follow the reverse steps of removal, ensuring to use new bolts and tightening them to the proper torque specifications.

comes part of the arm