Let me clear up a few things about "Bump Steer".
1) Bump Steer is the influence upon a vehicles steering when the suspension changes relationship with the steering components, such as steering while hitting a bump at the same time.
Steering alignment is configured when the vehicle is at rest and static. Any change in suspension position changes the angle and therefore the length of the steering arm and/or drag link. That change causes involuntary movement of the steering components and a possible change in direction.
2) Bump Steer is very common on four wheelers in rough terrain.
3) Bump Steer is less noticeable on sway-bar equipped 2WD vehicles.
4) Bump Steer is less likely to occur if the relationship of the steering arms and axles remain constant.
5)Since the rack is attached to the axle in this application, there is NO Bump Steer.
6) If the rack was attached to a frame crossmember, there would be considerable Bump Steer.
Got It?