I have a '69 that I have no history on. The rear end has some probs though that one of you brilliant peoples should be able to help me with. In reverse, if I turn too tight it hops and clunks and squeals and jumps and moans. Around tight corners in forward the rear squeals, but in a straight line everything seems fine. I have heard buzz words like "bad locker" or "spooler", how can I confirm what is going on without paying a shop to open it?