Since you likely have a '97 or newer Wrangler TJ, getting that rear 8.8 axle ready to install will be a pretty major job. It is set up for leaf springs and a totally different type of suspension than your coil spring TJ has. All of its mounting brackets & spring brackets would have to be cut off and then new Wrangler TJ type mounting brackets, spring buckets, etc. would have to be welded onto it. Just the brackets will run $300 minimum with $400 being more typical, plus the cost of the welder-fabricator to get it ready to mount.
The front D30 would be easier but you'd want to convert it from its present trouble-prone vacuum disconnect system by replacing the passenger-side 2-piece axle shaft with a 1-piece and then covering the disconnect mechanism opening with a piece of sheet metal. Not a difficult job but replacement 1 piece axle shafts aren't free.