Anybody else have 67 B'cuda Formula S with 7 1/4?

The 67 Formula S fastback I owned in 1970-72 was purchased straight off the car lot when the original owner (a nurse) traded it for a new 70 Mustang. It was box stock, with the 273-4 bbl, 904 Torqueflite, and a 7 1/4 open rear end that I had to eventually rebuild...the howling and clunking noises coming from the rear end was one reason she traded it. 45,000 miles on it when I got it.