Sorry to disagree with you but they do break..i've seen them grenade firsthand,they are very tough and can take a beating but like anything else you beat on it enough it's going to let go...
Sorry, but I have to pretty much agree with grumpus on this one. While certainly anything will break under the right circumstances, a correctly set up Dana will not be something you have to worry about especially with a 416. You will not break it.