Lincoln F75Z-5310-LA Spring - Front

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If the vehicle is equipped with air suspension, turn OFF the air suspension system. The switch is located in the area of the right kick panel. If the vehicle is equipped with four-wheel air suspension, disconnect the upper end of the front height sensor from the upper frame bracket behind and above the left shock, then firmly push in the red ring on the shock body, hold it there, and pull out the air line. Loosen the front wheel lug nuts, raise the front of the vehicle and support it securely on jackstands. Apply the parking brake. Remove the wheels. Using an open-end wrench to hold the shock from turning, remove the upper shock mounting nut. To detach the upper end of the shock absorber from the frame bracket, remove this nut, the retainer and the bushing; you'll need a back-up wrench on the lower nut to prevent the shock from turning when you loosen the nut. Remove the retainer and bushing. Working from underneath the vehicle, remove the two nuts (2WD models) or bolt and nut (4WD models) which attach the lower end of the shock absorber to the lower control arm and pull the shock out from below. Installation is the reverse of removal. Be sure to tighten the upper mounting nut and the lower mounting bolts. On vehicles with four-wheel air suspension, make sure that at least 1/8-inch of air line is inserted into the red fitting. Tighten the upper nut and lower nut and bolt. Lower the vehicle and reactivate the air suspension system, if equipped. It is possible to replace the shocks or springs individually but the unit will have to be disassembled by a qualified repair shop with the proper equipment, and this will add considerable cost to the project. You can compare the cost of replacing the complete assemblies yourself to the cost of replacing individual components (with the help of a shop). Loosen the front wheel lug nuts. Raise the vehicle and support it securely on jackstands. Remove the front wheels. Remove the nuts that attach the upper end of the shock to the frame. Separate the tie-rod end from the steering knuckle and secure it aside. Separate the upper balljoint from the control arm. Remove the fasteners attaching the lower end of the shock absorber to the lower control arm. Remove the shock absorber/coil spring assembly. Inspect the shock absorber for leaking fluid, dents, cracks and other damage. Inspect the coil spring for chips and cracks which could cause premature failure. Inspect the spring seats for hardness and general deterioration. If any of the components of the assembly are worn or damaged, have the unit serviced by a qualified repair shop or replace it. Installation is the reverse of removal. Be sure to tighten the fasteners. Tighten the wheel lug nuts. The shock absorber lower mounting fasteners should be tightened with the vehicle at normal ride height. This can be done after the vehicle has been lowered to the ground (on vehicles with adequate clearance), or can be simulated by raising the lower control arm with a floor jack.

Carefully lower the axle and remove the coil springs.

The bottom of the spring should be installed in the lower control arm.

Installation is the reverse of removal. Make sure that at least 1/8 inch of white air line is inserted into the solenoid. Finally, be sure to reactivate the air suspension system, then start the engine and allow the compressor to pump up the system to normal trim height.

In vehicles with four-wheel air suspension, you should disconnect the upper end of the front height sensor, push in the red ring on the shock body, hold it there, and pull out the air line.

When seated correctly, the lower end of the spring should cover the first hole and about half of the second hole.