It will be the steering damper, now, if you have replaced this recently, then the damper is propably fitted at the wrong angle, instead of being straight ( horizontal ) it should be pointing down at an angle. If you have not changed the steering damper, then i suggest that you do. In my experience, i would not recommend Monroe steering dampers fror Land Rover, try to get Old Man Emu,, Bilstein or Woodhead, or if there is a Britpart supplier, i can recommend the Cellular Dynamic. Hope that helps