The differential centre in the rear of the car is mounted in a subframe that holdes the rear suspension and the diff. There are 3 bushes that hold the centre in place. One at the back and one on each side. Unfortunately, they wear and split quiet often, even in a territory or something like that, so tend to go more often on the high power and possible harder driven cars. Manuals make the issue worse as there is the loading and unloading all the time on gear changes. It is a time consuming job and not to be done at home. Best left to the dealerships! Hope this helps! Mark