STRANGE axel twisted?

Scott, I have 30 spline Moser alloy race axles. They have lasted through a set of 3.73 with a powerlock,( blew the powerlock) 3.91 with powerlock( striped all the gear teeth off),3.91 with a spool(still good) in the 83/4. Now they are in the dana 60, the axles are 8 years old with no twisting or flaws, and that is with 8 years of dumping a clutch at 5000+ rpm and 1.5 60 foot times. I was always told not to worry till they twist one complete spline.