[Woodz428]

Bump steer is most generally a front suspension reference, I imagine it could be created by some IRS geometry issues. It is usually created by the lower arm and the steering arm traveling in different arcs, and usually happens when hitting "bumps", as it were. Having the steering link run parallel and having the same length as the lower arm minimizes or eliminates the issue. After it is already constructed the most that can be done is offset busings for the rack, to raise or lower it to make it more parallel to the arm. Most of the bump steer issues should be worked out in the lay out, because if it is set up badly enough a complete redesign is necessary.Fine tuning is the most you can do after the fact, and if it is a drastic problem it can never be "tuned" out.