GM 15938616 Rear Spring

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If the struts or coil springs show signs of wear such as leaking fluid, loss of damping capability, or chipped, sagging, or cracked coil springs, it is important to explore all options before starting any work. These components are not serviceable and must be replaced. To disassemble, remove the strut and spring assembly and the upper strut cap cover should be unbolted to expose the strut shaft nut. Use a spring compressor to relieve pressure from the upper spring seat, and unscrew the damper shaft nut while holding the strut rod in place. The nut and upper mount and bearing should be removed and laid out in the order they were taken off. The rubber parts of the upper mount and spring seat should be checked for cracks or deterioration and replaced if necessary. The rubber bump stop should be slid off the damper shaft and checked for deterioration. The compressed spring should be carefully lifted and set aside. To reassemble, the damper rod should be extended and the rubber bump stop should be installed. The compressed coil spring should be placed onto the lower seat of the damper, with the end of the spring resting against the raised stop. The bearing and upper insulator/spring seat should be installed, followed by the upper mount and mounting nut, which should be tightened to the proper torque specifications. The spring compressor tool can then be removed, and the strut spring assembly should be installed.

Next, use floor jacks to support the rear axle on each side, placing the jack heads under the coil spring pockets. Remove the shock absorber lower mounting bolts on each side and separate the flexible brake hoses from the brackets on each trailing arm.