I just popped a 30 spline outer on 42's and a 140,000mi 350/465/205. I wasn't even romping on it... the darn thing just went "pop!" Nothing violent - just a little climb over a boulder on a low 5 course. Just POP. Blew my mind.
Anyways, I've bought up a set of 4340 35 spline stubs. I'm sure hoping that I don't have to worry next. My next worry is my knuckles...
-Dan