I was at the dealer last week for some simple maintenance. I asked them to check out a slight grinding noise coming from the right rear of the truck. The service guy came out to me, and said the bearing was bad. He said they were a "mutha" to replace, so he said he'd call Nissan to replace the whole axle. I was shocked. He said it must have been a factory defect, and it's covered under warranty.
The truck goes in the shop tomorrow to have the work done - a day before I put my 2.5" lift in! I hope they don't run into any issues!