Right, there's a sticky thread in the general 80-96 Bronco forum on "SAS" or straight axle swap. I'm currently swapping both axles from an 88 F-350 under my 84 Bronco, using a leaf spring set-up in the front. If you can weld or have some welding done, it's simple to fabricate a front crossmember for the leaf spring mounts, and use the front-rear hangers with the rear spring shackles bolted or welded to the frame. You can also use a coil spring set-up in front with radius arms if you want to do more work.
Look inthe How-To & Tech Articles forum for a link to "Miesk5HomePage". You'll find several links to Bronco SAS articles and pics. JSM84