Lower

Removal

NOTE: To improve rear axle noise and vibration concerns, the rear suspension should be fastened to the frame and axle at the curb height position.

NOTE: If one arm requires replacement, also replace the same arm on the opposite side of the vehicle.

WARNING: Turn air suspension switch OFF (if so equipped).

NOTE: If both upper control arms and both lower control arms are to be removed at the same time, remove both coil springs.

1. Mark rear suspension shock tube relative to protective sleeve with the vehicle in a static, level ground condition.
2. Remove rear stabilizer bar.
3. Raise the vehicle on a hoist, and place jackstands under the rear axle.
4. Lower the hoist until the rear shocks are FULLY EXTENDED to relieve spring pressure.
5. Support axle under differential pinion nose as well as under axle.
6. Remove and discard the lower arm pivot bolt and nut from the axle bracket. Then, disengage the lower arm from the bracket.
7. Remove and discard the pivot bolt and nut from the frame bracket, and remove the lower arm from the vehicle.

Installation

NOTE: The rear suspension lower arms are inter-changeable side-to-side.

1. Position the lower arm in the bracket on the frame side rail. Install a new pivot bolt and NEW nut. Insert the bolt, so that the nut faces OUTBOARD. DO NOT tighten the nut at this time.
2. Position the lower arm to the axle bracket, and install a new bolt and new nut. DO NOT tighten the nut at this time.
3. Raise the axle to position that compresses shocks to previously established alignment marks.
4. Tighten the lower arm-to-axle pivot bolt to 140-180 N-m (103-132 lb-ft) and the lower arm-to-frame pivot bolt to 162-203 N-m (119-149 lb-ft).
5. Install stabilizer bar.
6. Remove jackstands and lower vehicle.