Thanks fish, I do have some wrench turning skills, do my engine work and such but as I said I am not comfortable with the back end of a Vette, if I had helped or done one before I would probably be up to it but have read too many threads about guys having difficulties with getting 36 year old bolts to come lose, I just don't have the expertise or tools to deal with that.
I would think if it was a lack of friction modifier, and that would be great if it was, then it would do it all the time. Yesterday I took it for a ride, not a peep out of it!
I believe it's where the axle goes into the diff, there is quite a bit of play there, more so than on the other side and I'm willing to bet that the diff has never been apart, the odometer is showing (when it last worked - I just picked this up in September), 102K on the clock.
thanks, Tony