Souperman, I will use a belt driven unit off of a pulley from engine, to a shaft in the upper handle bar with a u joint and a pulley, it will only be 2 wheel drive when it is strait, how ever I am working with a engineer to come up with a engagement unit that will allow the unit to be 2 wheel to be engaged on the fly or all of the time if wanted , I hope to have drawing ready next week of 2 wheel drive system and rear wheel drive system, to post for feed back, thanks Charles