GM Service Manual Online
For 1990-2009 cars only

Important: Do not straighten the axle housing in order to correct an alignment problem. If the rear axle housing is not straight, the rear axle housing must be replaced.

If rear tire wear indicates that the rear axle housing may be bent, or that the rear springs may be dislocated, check the alignment.

  1. Compensate for wheel runout the same way you check front wheel toe-in.
  2. Check the camber reading. This should be 0.03 degrees negative-0.05 degrees positive.
  3. Check the amount of toe-in. This should be 0-0.05 degrees or 0-1.58 mm (0-1/16 in).

You cannot align the rear wheels by regular means. Replace any bent or damaged components. Often the frame will not be straight. This can be verified with 3 dimensional measuring equipment. You can straighten the frame using frame straightening equipment.