I had an older friend in Macon years ago who was a retired engineer from Ford. He had a really nice collection of Ford muscle and police cars. One was a 69 428 SCJ Mustang. Factory 4 speed and detroit locker with 4.11 gears. This was back when we were in school in the early 80s. Then, it STILL had the original Firestone Wide Ovals on it. He said the detroit locker with the Wide Ovals was a recipe for disaster on wet pavement. lol