First thanks everyone for your thoughts and suggestions.


I did spend some time looking at the TC. The bolts to the flexplate are tight. The flexplate appears to be tight to the crank. The bolts to the crank appear OK but really can't see a lot. I did not see any cracks in the flexplate. I did not watch the flexplate/TC while bumping the engine over to look for any looseness. Will put that on the to do list. I also did not watch the converter with the engine running to see if there was anything obviously not running true. I have a 2 post lift, so can do that. The engine is externally balanced and the TC is a stock 10 3/4" neutral balance unit. I looked to see if there may have been a balance weight on the TC that came loose, but did not see anything. I have the stock shields on the bottom side of the bell that would keep any part that came loose from getting out. I did not find any loose parts in there when I removed the shields. I have not checked the engine to trans bolts, so that will be on my to do list.