Ford 5U2Z-18V124-EA Kit - Shock Absorber

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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.

You should first loosen the front wheel lug nuts, then raise the front of the vehicle and support it securely on jackstands. After applying the parking brake, remove the wheels. To remove the upper shock mounting nut, use an open-end wrench to hold the shock from turning while removing the nut.

It indicates that a worn or weak shock absorber is probably the reason for the abnormal movement.