Thanks Jay. I am looking for a NV241 4:1 ratio. Otherwise I would not replace the heavy duty Montero t/case. The reason for the swap is Ozzie gears are only 3:15, and with 37s I think 4:1 will work better, for about the same cost. The key to sorting out whether it is the right t/case sometimes is the lingo. Its a Rock Trac transfer case I need.