not really, I ran the 307 for 2 years (before the tcu mod came along) then ran a 327 for the next 3 years without a failure.
when i did brake a axle it was because i left the traction control on during a burn out,and the gears inside the diff were welded. if you get noise,(a howl ) from your rear it is not set up correctly,, Mercedes use of the snap rings as spacers, and it is one of the worse ways to set up a rear.
all wave trac's are made the same ,yet none of the center sections of our diffs. are the same, so when you build your diff. with a wave-trac you must set the ring to the pinion. or you will get noise, ware. and failure. I have had to cut down snap rings on two of the three diff's i have built. I have 2 sets of snap rings now as spares.
HOW did I do it ?, I used a fly wheel grinding machine and mic then every two turns. jim