That's the thing! When you rebuild properly (I know all the ropes, and have tested ceramic balls also), they last quite long on a low grip surface. B-Fast diff plates are great!
But high grip astro + bumps + jumps = ball diff killah!
@West Ridge: Do you have the time + equipment to modify Durango gear diffs to fit a B44 for me? I have a friend with a lathe, but the stuff has been at his place for 12 months now... he says he finds it too difficult...