I've been doing a little research on my 2-4wd conversion, since my decision to keep my 4 banger (swapping in my HO is just to much work LOL). I know the AX15 is the best swap, but if I don't find everything I need when it's time for my to button everything up then I may end up putting an AX5 in... at least they are cheap.
My truck will not be a crazy trail crawler or rock bouncer, just a good farm truck on either 31's or 33's. Why not use an AX5?