My knowledge of bump steer is this. You need to form a parallelogram with these 4 points. The lower control arm pivot. The inner tie rod pivot. The lower ball joint pivot. And the outer tie rod pivot. Can you explain how raising the upper ball joint pivot affects this? I don't see it. Doug
Maybe this will help you see... ;->
Rick
Per your diagram the center line thru the control pivots/inner tie rod is not parallel to the center line thru the ball joints/outer tie rod. Therefore the tie rod arc versus the lower control arm arc will swing on a different radius. This would produce toe change. Is this not correct? Doug
