I've been considering a different rearend or posi unit for my 66. Right now it's the original 10 bolt, dog leg. A friend of mine suggested the PowerTrax unit. He has never had a car with it, but has seen and drove quite a few that had it installed. Then I talked to another guy who has it in 2 of his old rods. He's very satisfied with it. For my situation Im thinking it just may work out pretty good. The Chevy II is just a sweet cruiser 327/350. What do you folks think about the PowerTrax unit, good, bad or ugly!