All the OD units are .78, but use different tail-shaft/adapters for the applications. It's a sun/planatary transmission with 1:1 and over drive gearing. Think, mini LENCO (sort of, except it uses a cone clutch instead of a stack)). They guys behind it came from LENCO (as did several other transmission manufactures).
Rewired everything with the new box, and the OD works mint again. Had it out to the big Friday cruise night and it worked perfectly.