I have searched and can't find any info on a 4wd conversion. Is it possible? I have looked at the hoye parts diagram, and the front axle and driveshaft appear to be the only difference.
It would be incredibly expensive even to buy a used assembly if you could find one. As mentioned you would also need a 4wd transmission. You would basically just be putting your engine in a 4wd tractor . If you need 4wd I would just trade yours in on one.