Lincoln 4L1Z-5500-BD Arm Assy - Rear Suspension

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The front suspension system includes a steering knuckle, upper and lower ball joints, upper and lower control arms, coil springs, and shock absorbers (or shock absorber/coil spring assemblies).

Turn off the air suspension system.

To disconnect the upper control arm from the steering knuckle, remove the cotter pin from the balljoint castle nut, loosen the nut a few turns (without removing it), use a small puller to break the balljoint loose from the knuckle, and then remove the nut. Afterward, remove the upper control arm pivot bolts and nuts. During this process, inspect the pivot bolt bushings for wear. If they are worn, the control arm needs replacement. Also, inspect the upper balljoint seal. If it's leaking, replace the control arm, as the balljoint itself is not serviceable.