Total bill was $285. They replaced the passenger rear diff seal, bearing and spacer, replaced the diff fluid, and repalced a lug and nut on the rear wheel that had started to strip when I was rotating the tires. They tried at first to say "you have some purple oil in there" and that is not compatible with the seals. I reminded them it was Royal Purple and about Magnesun-Moss, so they turned to over filling. I called them on this, but of course, their "repair engineer" was already gone. The service manager and this guy are supposed to call me today. I asked him if he thought it was really worth $285 to have another customer person never consider a Nissan again. He didn't seem to know how to respond to that. They put their crappy fluid in, at $17.85 a quart, so if I still have this truck, I'll have to replace that in 7,500 miles.
In case anyone cares, the gear oil they use has approximately half the dithiocarbamate and dialkyl dithio phosphate as Royal Purple or Mobil. Heck, the Supertech synthetic from Wal-Mart has more additives than the stuff they use. These two items are in oils for extreme pressure wear, and sliding wear. All gear oils use some form of these additives, whether petroleum or synthetic.