Ford 4L1Z-5A649-AC Arm Assy - Rear Suspension

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Some steps and precautions include turning off the air suspension system, raising the vehicle securely on jackstands, and removing the wheels as needed for access.

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.

SUVs have a rear suspension comprising coil springs, shock absorbers, upper and lower suspension arms, a stabilizer bar, and a track bar. Some models may feature air suspension systems known as Suspension Load Leveling Control or Vehicle Dynamic Suspension.