With that much power and size of tire you're going to want a full 1-ton axle. D60's or the equivelant. There are several manufacturers of D60 axles out there that are already built up (a regular google search should find those pretty easily).
Originally Posted by TallyZJ
Search and just reading the forum is a good start to gaining the knowledge you want.
On a Uni-body vehicle, one without a true frame, it is pretty useless to hang heavy axles on the uni-frame. Heavy axles with a strong motor will pretty much rip the control arms mounts from the body unless you can really beef up the mount areas.
He'll have a subframe that he'll be hanging them off of with Claytons
Still there is some truth to that - the unibody will flex (especially on a ZJ) and would be wise to stiffen it up some more.