I concur with Rick... (Did I really say that)
That's a lot of height :o of course you have to go a lot wider too, and on a trail, or obstacle, that's off camber it could get exciting. Below is a picture from Adam's Jeep Jam a couple of years ago. As you can see, there isn't much flex (still running Leafs in back and coils in front) and I think he's only running 35" or 36's. A lift isn't the only thing you'll be spending A LOT OF MONEY on. A Dana 44 isn't gonna hold up very well with 38's (Off Road) so you should start thinking about Dana 60's or equivalent, probably 5.13 or 5.38 R&P, at least 16" wheels or bigger so you can fit the larger Calibers and Rotors all around... the list goes on. If it's just a Mall Crawler then you could get away with not adding all the super strong stuff needed for the Trail.
(http://i238.photobucket.com/albums/ff278/Jack_Utter/adamsjeep-XJcarcrawling.jpg)
Now I'm NOT trying to talk you out of it, it's just WOW.... that's gonna be a BFXJ.
Tattoo :-\