awhile back when rebuilding my engine, was looking into transmission, thought turbo 400, picked one up that needs rebuilt. starting researching, original on mine was the t-200. unless your pushing lots of HP, dont go with a t-400, uses to much hp. go with a t-350. I got one that was in a 76 trans-am. works great.. so the 400 is still sitting in the barn. collecting dust. but i am holding onto the t-200. original equipment..