Lincoln 9L3Z-3050-A Joint Assembly - Ball

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Inspect control arm balljoints for looseness when separated from the steering knuckle. Check if the ballstud can be turned by hand. Replace any loose or easily turned balljoints. To check balljoints with suspension assembled, turn off air suspension system if equipped. Loosen lug nuts, raise and secure vehicle on jackstands. Remove wheels. Use floor jack to slightly raise lower control arm near each balljoint. For upper balljoints, use dial indicator against wheel rim and rock tire to check deflection. For lower balljoints, use dial indicator against wheel rim and prybar between control arm and steering knuckle. If deflection exceeds 0.125-inch, replace faulty balljoint. Balljoint replacement may be possible individually. Check with auto parts store for availability. Use special removal/installer tool to detach and install balljoint. Be careful not to damage rubber boot. Attach steering knuckle to control arm.

The need to replace the upper balljoint.

Ball joint replacement has evolved from replacing entire control arms to replacing individual ball joints due to aftermarket availability. You may be able to replace an individual ball joint for your specific year and model vehicle, even if the manufacturer has not addressed the procedure. Check with your local auto parts store for availability. A special ball joint removal/installer tool is necessary for this process and can typically be obtained from an auto parts store or tool rental business.