Zorro

Sorry for a noob post, but I'm considering a Pathfinder (preferably 2001+, with the 3.5L and manual tranny), and can't find much specific info. I'm wondering about the diffs and transfer case, specifically what's in there. Ratio, and most of all what sort of diff ... limited slip? open? lockable? torsen? Also wondering what kind of aftermarket stuff is available ...