The past few weeks we had a couple of heavy bursts of rain and when ive been on the motorway its makes a hurrendous vibration/can in a bike wheel type growling noise from the rear end seems to be more from the n/s/r, abyone every experienced this ?? im leaning towards three things - Possible rear diff (yet to replace) Possible rear discs as there drilled and grooved (but noise doesnt go when braking, need to swap to 300mm upgrade) possible wheel bearing (but ive not so long replaced them) any ideas ?? Driveshafts look all in good order only thing i found was the lower frt inner wishbone bush has slight movement but cant see it being that !!