Expedition 4WD V8-4.6L SOHC VIN W (1999)
Ball Joint: Testing and Inspection
Ball Joint, Lower
UPPER/LOWER ARM BALL JOINTS-FRONT SUSPENSION
WARNING: 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 RH kick panel area. 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.
NOTE: Prior to performing any inspection on 4x2 vehicles of the front suspension lower arm ball joints or front suspension upper ball joints, adjust
the front wheel bearings.
NOTE: Refer to the illustration for Steps 1 and 2.
1. Raise the vehicle and place safety stands under the suspension arm axle beneath the spring.
2. Have an assistant grasp the lower and upper edge of the tire and move the wheel in and out.
3. While the wheel is being moved, observe the lower spindle arm and the lower part of the axle jaw. A 0.794 mm (1/32 inch) or greater movement
between the lower portion of the suspension arm and the lower spindle arm indicates that the front suspension lower arm ball joint must be
replaced.
4. NOTE: If equipped with air suspension, reactivate the system by turning on the air suspension switch. Road test the vehicle for normal operation.
To check the front suspension upper ball joints, grasp the upper edge of the tire and move the wheel in and out. A 0.794 mm (1/32 inch) or greater
movement between the upper spindle arm and the upper portion of the suspension arm indicates that the front suspension upper ball joint must be
replaced.
