I wanted to do this using a calibra turbo gearbox and transfer box, turned 180 degrees so i have 6 reverse gears but then run an H22a honda engine that runs the other way around, but I was reliabley informed the helicals wouldnt like being spun backwards

Shame cause it would have been a doddle to do in my car and the gearbox is ideal cause it would end up rwd/4wd electronically selectable and also only normally transfer power to the front to pull out of a bend once the rear had started to slip.

ah well