- Raise the vehicle and place floor jacks beneath the lower control arms.
- Make sure the front wheel bearings are properly adjusted.
- Inspect the lower ball joint and replace the lower control arm assembly, if required.
- Have an assistant grasp the bottom of the tire and move the wheel in and out.
- As the wheel is being moved, observe the upper control arm where the spindle attaches to it. Any movement between the upper part of the spindle and the upper control arm indicates a bad ball joint, which must be replaced.
Removal & Installation
If the vehicle is equipped with air suspension, the electrical power to the air suspension system must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch located in the luggage compartment. Failure to do so can result in unexpected inflation or deflation of the air springs, which can result in shifting of the vehicle during these operations. Failure to follow these instructions may result in personal injury.
On 2005 models, the ball joint is not serviced separately. If the ball joint is faulty the upper control arm and ball joint are replaced as an assembly.
- If equipped with air suspension, the air suspension switch to the OFF position before raising the vehicle.
- Place supports under both sides of the frame just behind the lower control arms.
- Remove the wheel.
- Place a floor jack under the lower control arm at the lower ball joint area. The floor jack will support the spring load on the lower control arm.
- Remove the retaining nut and pinch bolt from the upper ball joint stud.
- Mark the position of the alignment cams. When replacing the upper ball joint this will approximate the current alignment.
Remove or disconnect the following:
2 nuts retaining the upper ball joint to the upper control arm
Install or connect the following:
Upper ball joint to the upper control arm
- Remove the floor jack from under the lower control arm.
- If equipped with air suspension, turn the air suspension switch to the ON position.
- Check and adjust the front wheel alignment.