That seems to be the #1 mod *most off roaders do to their 40's. The plate adaptor is cheaper than the AA kit & will let you have the longer rear driveshaft. I run an SM420 plate on the 40 & an SM420 AA kit on the :Pig: If I would do it again, I'd run a plate on the
but I already had the AA kit. There's ALWAYS someone looking for an SM420 adaptor in the Parts Wanted section.