The car has 75k from new (!). The SLS system has been overhauled and works perfectly and has new accumulators. The sway bar mounts and control links are new. The diff mount is new.
When I go over smallish bumps there is occasionally a dull thunk from the rear. Riding in the back it seems to be more central than on one side and almost sounds like the entire rear axle is loose. The front mounts for the sub-frame are new as well btw. The flex disks are almost new too.
Does anyone have ANY ideas what I can check next. Using a crowbar I can't find anything that moves underneath either.
thanks