Well, I replaced my 4.10 front diff with the 4.56 diff I bought off ebay today. The only part that was hard was getting the new differential into place. That son of a gun is heavy. I had to have my girlfriend lift the jack while I guided the differential into the bolt holes. I hope I didn't do anything to screw anything up too bad. I don't think I did, but I'll find out. As soon as I get my lockright and put it in the rear 3rd, I'll be set.
-Nathan