It's your Panhard rod bushes! I know. Trust me!
The Panhard rod is the big one that goes accross the car with one side linked to tthe body and the other to the axle assembly. Just replace those bushes - its not that hard - and its fixed. Use OEM rather than aftermarket stuff.
I know ... the same thing cured my constipation a few times before I worked it out. That was on an RRC but the principle is the same.
Willem

