No, not in a wreck. I had the A/C installed, it never had one before. Yes , Andy is right it is simple vibration from 50,000 plus miles of use. My axle is fine ( it's a replacement from Andy and I also run Centramatics). The owners manual gave a warning that these bolts can loosen and should be checked periodically. I missed seeing this information. I just wanted to make others aware that ,yes it can happen.