1. WARNING: IF EQUIPPED, THE ELECTRICAL POWER TO THE AIR SUSPENSION SYSTEM MUST BE TURNED OFF PRIOR TO HOISTING, JACKING OR TOWING AN AIR SUSPENSION VEHICLE. 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. CAUTION: The rear suspension fasteners are important parts because they effect performance of vital components and systems and can result in major service expense. They must be replaced with the same part number or an equivalent part if replacement is necessary. Do not use a replacement part of lesser quality or substitute design. Torque values must be used as specified during reassembly to ensure proper retention of these parts. Orientation of the fasteners is also important on all rear suspension arms. Make sure the fasteners are installed in the same direction as when removed. If equipped, turn the air suspension service switch, located in the luggage compartment, off. 2. Mark the rear suspension shock absorber relative to the protective sleeve with the vehicle in a static, level ground position (curb height). 3. Raise and support the vehicle. Refer to «Section 00-02». 4. Remove the wheel and tire assembly. Refer to «Section 04-04». 5. Use Hi-Lift Jack 014-00942 or equivalent to support the rear axle. 6. WARNING: DO NOT REMOVE AN AIR SPRING UNDER ANY CIRCUMSTANCES WHEN THERE IS AIR PRESSURE IN THE AIR SPRING. DO NOT REMOVE ANY COMPONENTS SUPPORTING AN AIR SPRING WITHOUT EXHAUSTING THE AIR. If equipped, release the air pressure from the air springs. Refer to «Section 04-05». 7. Note: If both rear suspension upper arms and both rear suspension lower arms are to be replaced at the same time, remove both rear air springs. Refer to «Section 04-05». Remove and discard the rear suspension lower arm pivot bolt and nut from the axle bracket. 8. Remove and discard the rear suspension lower arm pivot bolt and nut from the frame bracket. Remove the rear suspension lower arm. Installation 1. Note: The rear suspension lower arm bolts must be tightened with the vehicle at curb height. Note: The rear suspension lower arms are interchangeable from side-to-side with “OUTBOARD” stamped on the side of the arm for positioning during installation. Position the rear suspension lower arm to the frame bracket and install a new pivot bolt and nut. Insert the bolt so the nut faces inboard. Do not tighten at this time. 2. Position the rear suspension lower arm to the axle bracket and install a new pivot bolt and nut. Insert the bolt so the nut faces outboard. Do not tighten at this time. 3. Raise the axle assembly to the position that compresses the shock absorber to the previously established alignment mark (curb height).
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