I might be wrong as I mainly know 727's but I believe they changed some seals and possible a bushing size so if I were you I'd get one for your year trans. and you need to verify that since your not positive it's original. The way to do it is look on the drivers side of the trans. right above the pan rail there's a machined pad with numbers on it (might be covered with grease/grime so you may need to clean it to read them). Get those #'s and post them and we can help you figure out what year it is.