Lincoln 7L1Z-3078-A Front Suspension Arm Assembly

The rear suspension for trucks consists of multi-leaf springs, shock absorbers, U-bolts attaching the rear axle assembly to the leaf springs, front hangers with rubber bushings, and shackles connecting the rear ends of the springs to the frame. An anti-wind bar is present in trucks with rear air suspension, preventing axle and spring twisting during braking and acceleration.

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.