An 80 is a poor choice as a platform for a rock crawler, way too big, way too heavy, you should reevaluate what it is you want to do. If you want to build the truck to run hard trails, you will destroy it in the process. If that is what you want to do, a crawler box should not be your first concern, you are going to need some real axles.
Are you sayin the 80s axles arent good enough? Look at ur crew thy run some big meats on these axles.

. if all they need is a tcase to figure it out or make a set that's awesome!! unfortunately i dont have one or i would send it!! unfortunately i now it make take some time but hey at least someone will be working on it! When the suzuki samurai had little or no aftermarket it came down to someone( Tim Hardy)in there garage to make a prototype. now suzuki has gearsets galore.