I agree with MacGyver.
The other issue with a ranger, the older 4x4s had that swing axle style front end where the axles, diff and outer joints are all integrated into one large unit, it would be almost imposible to convert to any other style of differential.
Newer ones got A arm style front ends, but even with those (or any other similar 4x4 front suspension), there isnt much room in the outer CV joint area to come in from a different angle. The VW CVs wont handle much angle according to what I have read from people who wanted to jack one up.
On the other hand, if you want to build a rock crawler/bush buggy/tractor, toss out the ford engine and tranny and drop in a golf/jetta engine & auto tranny turned 90 degrees (engine and axles in front-back orientation), with custom axles hooking up to ford differentials. Super low gearing!