Mystery Transmission

[dave.williams@chaos.lrk.ar.us (Dave Williams)]

-> It is an all-aluminum case, in 3 parts.  The main Box is
-> extensively ribbed and measures 9' from mounting flange to rear of
-> box.

 I don't know about a Box-with-a-capital-B, but your description sounds
like a Borg/Warner T-50.  The T-50 was designed for the Wankel Vega.
When the GMRE was canceled the transmission carried forward to the
piston engines cars.  This transmission was the immediate prececessor to
the T-5, which uses the same shaft spacings, etc.