Ulf, Chrysler replaced 5 spider gears in my original '65 Dart before the warranty ran out. It was a ridiculous and expensive decision to put a 7.25" diff in an A body with a 273-4bbl and 4-speed. I was running 13" cheater slicks and the diff couldn't handle the stress. Of course I removed the slicks when I had the car towed to the dealer for warranty repairs but the service guys knew I was racing with slicks at Phenix City Dragway because they were there and helped me set up my Dart for maximum performance.
