Their is a strange problem with my disco, it is a 300Tdi auto. As I am not that good at transitions (bit of a black art that). when driving my disco when I get to 1800 to 2100RPM I get a bit of a rattle from the transfer box it dose this when stationary or on the move. I cannt seem to pin it down more than that. Other than it being something lose inside I cant see why it would rattle when not moving.