2003 C5 with vibration from the back

carl-1968

A4 sold, lots of bits available, ask for details
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RS6 off the road.....sounds like rear diff trouble, anyone got any experience of this, feels like the rear end is welded!! when turning on hard lock and crusing at any speed there are regular thumps from the back end?.
I'm thinking it could be:
a, Rear diff not working corectly
b, limited slip problem
c, centre propshaft bearing problem
d, Torque converter issue (this was done with the gearbox less than 2k covered)
e, any other ideas?
Thanks
Carl