Randy:What were you doing when it broke? Beating on it, just cruising, fast shifting, fast takeoff? That trans is not very strong in the first place, hence many guys are replacing it with something stronger. That may mean there are some usable used ones around. If you want to beat on it a little, the first step up would be a T85, which was available in wagons, police cars, and such. Also into the mid 60s in big engined cars, such as 352, 390, 406, 427. Next step up would be a "toploader", as strong or stronger than a T85. Mustang 5 speed overdrives are the hot ticket now, all synchronized gears and an overdrive to boot. This is not all the choices, but seem to be the most common ones.
John