Well I was on a downhill, wheels turned all the way to the right in reverse backing uphill and SNAP! Im runnin 37s with a front aussie and it broke. And no, I wasnt getting it either it was at like 1200rpm

Always gotta remember metal over time builds a memory strength it will like being twisted one direction over another and the older that piece gets the better (or worse) the memory becomes. Then when you try to reverse that memory (by backing up in a bad situation) you will get to hear that dreaded ping sound of an axle snapping. That is also one of the main reasons you never ever want to pull a stuck rig while trying to back up, puts the load on the wrong side of your memory.