1970 3 speed on a 68 273?

I've been building stick tranmissions for around 50 years. I still don't know any numbers, I just look, and count teeth. These old transmissions, odds are, aren't original inside anymore anyway.

What I'm looking at is probably a B body, 23 spline 4 speed, and judging by the other picture of the extention housing, it's all cast iron. Just a good old fashion Plymouth or Dodge B body hot rod. The only thing that throws a big question mark to me is the late side cover bolted on it. The trans doesn't have the B body reverse spring and detent on the main case, it's in the side of the case and into the side cover. I don't know what year MOPAR changed. Pulling the side cover to expose the gear set inside would settle exactly what it is.

It's a good trans, but a pain in the *** to get to fit in an A body. You might not like doing the modifications to get it to fit, but it is do-able. There is about a half dozen ratio possibilities it could be if it's a straight 4 speed.

Russ.