I have a `72 240 with the stock 3 spd auto transmission. The transmission is acting up-slipping in first and reverse. It has never had a rebuild and the odometer's turned over at least once. What I want to know is, is there a later model transmission that will fit in my z? I want to stick with the automatic because I don't feel up to the challenge of converting to stick. I'm looking for something better than the stock 3spd. Is there such a thing? -Jason.