I'm going to buy a 2011 Xterra. I'm looking at the S 4x4 AT right now. Seems to be the best deal. Since I had a gen 1 in the passed I'm not too familiar w/ the gen 2 x. When comparing the different trim levels it says the MT X's have a dana rear diff. I was under the impression that all gen 2's were Dana 44's. Are there two different diffs used on the gen 2 now?