Sorry, but this thread is nonsense. It’s maybe the 3rd or 4th post where you’ve claimed that everyone’s giving you BS about rebuilding a diff. Well, considering I’m one of those guys who has provided plenty of information through forum posts and direct messages—the same guy who has rebuilt several of these units, done numerous axle projects, who hoards Nissan diffs and axles, and even offered to send you a completely rebuilt unit when you first started complaining about it—I’m trying to not take this personally. But frankly, I think you’ve got some unrealistic expectation from all the shops you’ve contacted and are probably poorly conveying the problem, and it’s these posts that are becoming BS.
Seriously, you’re asking about what is effectively an SAS without steering components, yet you won’t just go to a damn junkyard, pull a <$200 differential from practically any Pathfinder, Hardbody, Frontier, or Xterra, check the backlash with a $10 tool, and swap it in? A day, tops, in labor, <$300 in parts and fluids, and access to the exact Factory Service Manual used by Nissan technicians, to be done with this problem? You even have an opportunity to improve your driving and towing characteristics (via upgrade to LSD and/or lower gearing for a whopping $0 extra), without having to deal with any of the front gearing because you’re 2wd?You’ve got to be kidding me!
Face the fact that most shops don’t have experience rebuilding Nissan diffs because they probably don’t fail often. But any drivetrain or off-road shop can simply rebuild that diff for whatever they charge Toyota guys. It’s the exact same design, and it’s a trivial one requiring little more than hand tools to swap, and not much more to rebuild. Bearings can be bought on RockAuto, and diff gaskets from Nissan for cheap. And the FSM describes every single step to do it!
But here we are talking about swapping entire axles from Fords! I can tell you it’s significantly harder than just going to a junkyard and buying an axle from a Pathfinder, and yet still more difficult than just pulling the diff. I say get your hands dirty or get rid of the truck if this is really the hassle and decision you’re facing.