Tough call, but if you're going to be doing a re-gear/disc upgrade/differential swap on a 8.25(could obviously save money and find a 4.10 8.25, but,...)You might want to consider a ford explorer 8.8 swap instead. I know it's not factory parts, but, a little searching(not much) can turn up an explorer rear axle with 4.10 gears, disc brakes, and a limited slip(clutch type) that's a pretty easy swap. You could finish the rest of the build, and then swap in a rear tru-trac at your leisure. It would save the cost of rear gears and rear discs.