I was lucky and found a D21 axle housing for the Pathfinder disc swap. I'm still searching for a R180 in 4.375 or 4.625 (I found both ratios). So far, I've just been repairing small odds and ends on the truck to make it more drivable.
Once I find a front diff, I'm planning on swapping the rear in to give the truck some grunt back. Eventually, I'll be swapping to a KA24DE out of a frontier with a 240sx intake and harness. Hopefully, that will be much later down the road.