[RC-Monster Mike]

Bumpsteer is often caused from the steering linkage and suspension arms being on a different plane thoughout the range of motion. It can often be minimized with proper shims - with the suspension arms level, try to get the steering linkage/turnbuckle to be level with the lower suspension arm as a start point. Sometime people simply install the turnbuckle on the wrong side of the steering knuckle(top instead of bottom or vise versa), which results in huge amounts of bump steer. :)