Crap ujoints, lol.

I will take u-joints over birfields any day. If you flip the yota axle over, how do you intend on keeping the internals properly oiled. It isnt designed to run upside down.

For all the money you would spend to get a custom axle, you could build a dana 60 with alot of goodies.

I dont mean to be a stick in the mud, but the mitsu axle isnt as strong as every one makes it out to be. For our aplication, which is low torque high gears and low hp, sure. But it is a 9inch rear, same as a ford 9, nothing new or special. A dana 60, or a 14 bolt is stronger than a mitsubishi axle any day. Machine the bottom of a 60 or 14 bolt housing, and you wont be losing much clearance under the diff either.

A sas is already going to need alot of complicated custom work, dont shoot yourself in the foot and make it any harder.