I Have broke two front U joints, both times taking out a shaft and one rear axle running 10 bolts and 35's. The time I broke the rear axle was the day after wheelin and it broke when my locker enguaged driving down a prety buisy street. I was lucky I was able to slow down and pull off just as my axle came completely out. It did come out and my wheel and about a two foot section of axle rolled and hit my front fender. Looking back on this, it was lucky the axle didn't come out at a higher speed. Someone could have been really hurt or killed. I think a lot of us, including me don't always think about breakage while driving down the highway.