I'm starting to wonder if this is a failure or just monumentally bad tyres of F***en proportions.
I think bad tyres exaggerate the problem, I had some cheap crappy ditchfinders on that came with the car, downright dangerous in the wet. Goodyear Eagle F1`s have helped but not cured, so that leaves diff mounts, rear wishbone bushes or rear dampers.
I don`t think it will be the void bush because it`s designed to move anyway, I changed the ones on my Senator after 250k and it didn`t make an ounce of difference so thats my last port of call.
I don`t think it will be a rear damper, it doesn`t drive like one has failed so that only leaves the diff mounts an dinspection will have to wait until the weather fairs up and I have the time.