EDIT: Anyone had any experience bearing changing/rebuilding a diff?[/QUOTE]
Dont drop the oil all out,add some Wynns and see if it goes.I have spare 535 diff so you are welcome to swap, leave me the original and I`ll do the bearings,do not have tolerances but cannot be too tricky, done toyota, Range-Rovers and all three of Metro`s(two bloody times!),bought engineers blue in bulk for that one.Does yours have an LSD, if so remember they use different oil and Wynns will piss it off.