hi all, I just bought a ba 2002 xr6turbo and have discovered a thumping noise comeing from the diff? this occours only when changeing through the gears and have since taken it back to 2 different ford dealer workshops and they say there's nothing wrong and that this noise is normal..I dont think this is normal and I think they are just pissing in my poket trying to save a buck from repairing it .. any ideas or thoughts would be welcome..I'mtakeing it to pedders this week to see what they say b4 I go back to ford with extra possiable causes. thanks for all help...regards jeff