I have access to a 96 big bear 4wd that is blown up and considered junk. They say the 4wd worked fine. My new to me 2001 Big Bear 400 is only 2wd. Looking at it I see mounts for the front diff and caps where the hubs would receive the axles. Do these parts interchange? Can it really be that easy? The transfer appears to bolt on where the u joint is for the current driveshaft and I assume there is a shorter driveshaft on the 4wd to make up the difference in length? My apologies for all of the questions but I am farmer that uses my machines for daily chores in all sorts of bad conditions and 4wd would be very nice if not necessity at times.