Tansmission/driveshaft/diff play questions?
I'm in the process of changing the fluid in the c4 and have noticed that I can rotate the driveshaft a noticeable amount while in park. It seems to rotate roughly the same amount at each end indicating some play in both the tranny and the rear. Other than occasional thunking into gear when theres no load (eg shifting into 3rd @ 30mph, or going from reverse to drive) there arent any real problems, though there is occasional quiet diff whine @ 60-70.
How much play is ok, what possible problems could it cause and what are the fixes?