Well, I'm no fabricating expert, but its obvious you won't likely find one of these ready to bolt in to a TJ. You are dealing with some big axles here, so to put a 14 bolt in the rear you will likely want to stretch the wheelbase a bit so your driveshaft isn't too short. That means you would have to relocate the gas tank. So, not only do you need to do work to the axle (brackets), but you will need to mess around with the frame, suspension, and gas tank too. That's pretty much just scratching the surface on the rear axle.
The front, you will need to mount up your brackets, which sometimes gets hard with the pumpkin being so large and offset. Then you will need to customize your steering setup to accommodate the new knuckles and larger width. Which brings you to the next issue, figuring out your desired width because neither of these axles will be stock width.
Well, maybe someone else will chime in, but I suggest doing some reading and searching if this is just a casual question. There is plenty of info out there.
Red Jeep Club Member 111
'99 TJ - work in progress...see profile
'08 WK - Silver RME, DD.