I agree it can happen to any stock flex plate. I have a Mopar Sfi approved in the race car. I also have one in my 96 ram diesel as the stock one on it failed miserably and it too caused a vibration when it failed. Even though it is only a stock hauler/daily driver it has an upgrade flex plate. Good insurance. Flex plate bolts are always a good application for loctite. I work for an oem car manufacturer, and those bolts always get thread locker.