i have the same problem with my three door at 130mph its kak your pants time the car needs two lanes to keep going its a nightmare(as well as fookin dangerous) there is no play in my steering but the wheel is stiff i think it is a seized ball joint but i am changing the t.c.a's the top mounts on the struts and the track rod ends nothing left to change apart from the rack.........oh have you checked the steering coupling as it joins the rack cause the rubber uj on mine was split.