8 1/4 vs. 8 3/4

I've been running 8 1/4 behind 383/727 for a few years now and never had an issue. It's got 4.10's and Sure Grip. I'll probably jinx it now but it's running fine. I've got an 8 3/4 at home that needs shortening and the like for when the 8 1/4 goes.