Finally some good news for once.
A good friend of mine, who happens to be a service advisor at the Nissan dealer I bought the Pathfinder at back when I lived in Ohio, reached out.
After some string pulling and phone calls, the lifetime powertrain warranty from the dealer I originally bought it from, SHOULD be fully covering all of this now, out here!!!
The rear end, coupler, transfer case, and also the transmission is fully covered until 999,999 miles, $0 deductible also. Which also means I'll be getting a brand new t case and not a used unit.
Gonna go buy a lottery ticket now.