Lincoln 1L3Z-3079-BA Arm Assembly - Front Suspension

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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.

When dealing with stubborn fasteners due to rust or corrosion, use penetrating oil, wire brushes, and caution. Strategies like applying a sharp blow with a hammer, heating the fastener area, or using breaker bars can help. However, exercise caution to prevent thread damage or fire hazards. Replace difficult-to-unscrew fasteners with new ones. For safety, use reliable jackstands and prefer a hydraulic floor jack for lifting and supporting components during various operations.

Reattach the balljoint to the steering knuckle and tighten the ballstud nut. Reattach the 4WABS front brake anti-lock sensor wire bracket and tighten the bolt securely. Install the wheel and lug nuts, then lower the vehicle and tighten the lug nuts. Finally, tighten the upper arm pivot bolt nuts and reactivate the air suspension system, if equipped.

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.