Regaring the 2005 drive train configuration, the interior picture of the 2005 xterra in the nissanusa.com future vehical gallery seems to show some sort of (2WD,AUTO,4LO and 4HI) selector. Also, if you look at the push buttons on the right, it looks like there is a drive train related switch (possbily locker?) Anyway, the picture is not perfectly clear, but you can see it below. What do you folks think?

Image link
http://www.nissanusa.com/m/cma/v/fuv/fuv_xterra_gal_lg02.html