Ive just fitted a new second hand steering box(perfect condition) on my disco 200tdi and ever since I fitted it I have a vibration that is felt throughout the car at between 30 and 60mph,it goes away if I take my foot off the throttle and it gets slightly worse when I go around left hand and right hand bends,its not like a wheel shake like when the wheels want balancing,its definitely a vibration,by the way the vibration was not there until I fitted the box.Any ideas anyone????im scratching my head.