I've had a driveline clunk developing in my manual 1981 505 over the last few years and the last time this happened I had the tailshaft replaced and it fixed the clunk. This time when I took it to my usual mechanic he said he doesn't think its the tailshaft but a worn diff, which he diagnosed by turning the rear wheel and checking for play.
I checked this myself by jacking up one rear wheel and there is 1 to 1.25 inches rotational play measured at the top edge of the tyre. Does this amount of play indicate a worn diff?
I can feel the clunk mostly when I change gears when I have to feather the clutch to get a smooth shift, and also when cruising at say 2500rpm and suddenly increasing or decreasing the revs.
I checked this myself by jacking up one rear wheel and there is 1 to 1.25 inches rotational play measured at the top edge of the tyre. Does this amount of play indicate a worn diff?
I can feel the clunk mostly when I change gears when I have to feather the clutch to get a smooth shift, and also when cruising at say 2500rpm and suddenly increasing or decreasing the revs.