Well it was the centers that broke heres a pic of what fell out when i dropped the cover
That sure looks like the lock bolt fell out , then ka-boomb . The bolt needs to be installed correctly after the axle shafts , on that application . If the bolt is not secure , the whole install is at risk. Some of these don't have a bolt at all , merely a snap ring. The responsibility is on the installer to get it right , botch the snap ring install and BOOOM , get it right = success.