The Truxtell O.D. was great, I saw several of them back in the '50's. A friend had one that in 2nd overdrive would do about 80 M.P.H. They bolt onto the back of the trans. where the torque tube fits, then has a back side the same as the trans. All you have to do is shorten the torque tube the same amount as the length of the unit, and bolt it on. It is shifted by another shift lever. If you have one keep it, they are extremely rare these days.
