Rear end alignment should be checked whenever the front end is aligned. If the rear toe and tracking are not set correctly, accelerated tire wear may occur. The thrust line of the rear wheels may also be affected. The thrust line is the path the rear wheels take as they roll down the road. Ideally, the thrust line should align perfectly with the center line of the vehicle. If the thrust line is not correct, the vehicle will slightly understeer in one direction and oversteer in the other. It will also affect wheel centering.
Rear toe-in should be adjusted prior to setting the front alignment angles. Adjustment is made by loosening the jam nuts on each rear lateral link and turning the rods in or out until the toe is within specification. The rods must be turned an equal amount on each side.