GM 20906121 Rear Suspension Strut Assembly

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If the struts or coil springs show signs of wear, they must be replaced as they can't be serviced. Before starting, check the cost and availability of parts. To disassemble, remove the strut and spring assembly and mount the strut clevis bracket in a vise. Use a spring compressor to relieve pressure from the upper spring seat. Unscrew the damper shaft nut, remove the nut and upper mount, and check the rubber portion for cracking. Remove the upper spring seat from the damper shaft and inspect the rubber portion and bearing. Check the dust boot and rubber bump stop for cracking and replace if needed. Remove the compressed spring. To reassemble, extend the damper rod and install the rubber bump stop and dust boot. Place the compressed coil spring onto the lower seat of the damper, install the upper insulator and spring seat, followed by the upper mount and mounting nut. Tighten to the proper torque specifications, remove the spring compressor tool, and install the strut spring assembly.

To install the strut, guide the knuckle into the strut range and position the upper part of the strut to mount it to the body.

Start by loosening the wheel lug nuts and raising the front of the vehicle on jackstands.