If the vehicle has air suspension, turn off the system. Locate the switch in the right kick panel. Loosen lug nuts, raise rear of vehicle, and support securely on jackstands. Block front wheels. Remove rear wheels. Support rear axle with floor jack under differential. Remove shock absorber mounting fasteners. To detach upper end of shock absorber from frame on truck, unscrew nut with ratchet between frame rail and bed. To detach lower end from axle bracket on truck, remove nut and bolt. To detach upper end from frame on SUV, remove nut and bolt; to detach lower end, remove nut and bolt; if removing suspension arm, remove indicated bolts. Remove shock absorber. Installation is reverse of removal. Install nuts and bolts in proper direction. Tighten all fasteners. Reactivate air suspension system, if equipped, after lowering vehicle.