You may or may not have to address the driveline length too. I think the D44 is close, but...drivelines don't stretch or shrink very easily, especially since there is a carrier bearing in the middle of yours.

PS, you do know there is an ARB and an Aussie Locker available for your 12-bolt, right? What exactly are you looking for in the D44? You are even limited in gears because of the front 10-bolt.

Good Luck,
Michael