GM 20951599 Rear Shock Absorber Assembly (W/ Upper Mount)

Loosen the wheel lug nuts, raise the vehicle, and support it securely on jackstands while blocking the front wheels to prevent rolling, then remove the wheel. Support the rear lower control arm with a floor jack positioned under the spring pocket, ensuring the jack remains in this position throughout the procedure. Open the rear hatch or trunk and remove the trunk liner or seat back. Remove the lower shock mounting bolt and the nuts securing the upper shock mount to the body. Maneuver the shock out of the vehicle, and if new shocks are to be installed, swap the bracket to the top of the new shock. Installation follows the reverse of the removal procedure, taking care not to remove the fiberglass strap from the new gas-filled shock absorbers until they are installed. Finally, tighten the mounting fasteners to the specified torque, raising the lower arm to simulate normal ride height before tightening the lower mounting fasteners.

Guide the assembly into the fenderwell, insert the upper aligning studs through the body holes, and install the bolts, leaving out the one for the crossbrace. It is advisable to have assistance due to the weight and awkwardness of the assembly.