My u-joint broke yesterday when I was driving down the road. First time my Blazer ever broke out on the road. The thing still drove though, I think these things were built like tanks or something. They just don't quit. I've been hit by a deer once too, and that didn't even put a dent in my truck. I believe these things are pretty much unstoppable. Well the u-joint was easy to fix and I was on my way again ROOORING down the road. Just thought I would share.