I have a 93 disco 2.5 tdi. When travelling at 55+mph, if the car goes over any bump (pothole etc) the car starts shaking real bad, i can still change gear, accleerate, and brake, and the shaking doesn't stop till the car goes below 30/35mph. Can anyone tell me whats happening and a rough idea of fix price. Don't want to get mugged off by a garage.