kimo,
I do a lot of B/W Overdrives. Many of the internal parts, planetaries, roller clutches, blocker plates are universal. Anything with a B/W, be it Rambler, Stude, GM, Ford, Packard, etc have interchangable components. The main differences are the case and the input shaft to connect to the OEM transmission. It is quite possible that yours has B/W internal components.
Fred
