from what I've seen, all of the connections were cut off the ford axle and new mounts were welded on where they needed to be. As well, it is very important to measure perfectly or it will not track right on the road.
This is a kit for a ford front axle to be put into a YJ, cut off the old parts, weld these on and away you go!
Not sure on the rears, but this should give you an idea anyways...
Dave's Customs Unlimited: YJ Full-Width Axle Kit for Ford front axle