I've put a set of 4:11s in my 53 3600, ran a wanted ad here on the bolt and got a nice complete pumpkin. I think this was out of a 69 or so 3/4 ton Chevy that came from the factory with an automatic trans, which came with 4:11s. It's a direct bolt in JOB. And it is really great on the top end but mostly I was surprized how nice it goes through all the gears vs the crawl.
