I am doing a little project on a ford focus 3door 1.8 zetec, i am looking at reducing the gearing for grass/gravel racing. i have looked at using the ford transit VXT-75 fwd gear box as this looks like the cheepest way to do this without buying new gear shafts etc... I have read that this is a simlar design to the focus gear box (MTX-75) would this fit on the focus, also could i put a MTX-75 diff in the VXT?

any help is appreciated