hi there new to this but really need help ,i recently purchased a landrover freelander td4 6 months ago and to start with it was fine ,then on a short run out i noticed a whirring noise from under the vehicle this got progresively worse and then a banging noise ,iv parked the vehicle as im frightened of causing more damage ,just wondering if anyone has got any ideas to what it might be as i know nothing about 4*4s before i take to garage to be repaired .any help would be appreciated .thanks paul