IMHO, the ball diff design in the b44 platform needs to change. It needs to use a much larger diff ring, some how. That would keep it smoother for longer like the the 2wd transmission. I can build a diff that will last longer than the outdrives in my T4.1 using huge tires and a 6.5 with the slipper tight as sin, but my b44 diffs wear out much faster.

My theory is that the balls and rings are exposed to more torque the closer the the center they are and thus chatter and tear up the rings far easier.