GM 23312165 Front Coil Spring

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To remove the rear wheels, first loosen the lug nuts, then raise the rear of the vehicle and support it securely on jackstands placed underneath the frame rails, blocking the front wheels to prevent rolling. If the vehicle has Autoride®, unbolt the height sensor linkage from the bracket on the trailing arm without changing its adjustment or prying on it; pivot the linkage up and support it to avoid damage. Support the rear axle housing with a floor jack under the differential, detach the rear axle vent hose, and unbolt the track bar from the rear axle housing. Disconnect the lower ends of the shock absorbers from the axle housing, then slowly lower the floor jack to extend the coil springs, ensuring not to exceed the slack in the flexible brake lines or wire harnesses, detaching them if necessary. Once the coil springs are fully extended, remove the springs and insulators, checking the condition of the insulators and replacing them if they are cracked, hardened, or deteriorated. For installation, place the springs and insulators in position on the axle and raise the axle until the ends of the springs engage properly with their upper mounts, ideally with assistance. Continue raising the axle until the shock absorbers can be connected to the axle housing, then install and tighten the bolts and nuts to the specified torque. Connect the track bar to the axle and tighten the bolt to the specified torque, reattach the vent hose, and reconnect the brake hoses and wire harnesses if necessary, followed by bleeding the rear brakes. If equipped with Autoride®, reattach the height sensor linkage, then install the wheels and lug nuts, lower the vehicle, and tighten the lug nuts to the specified torque.