Oh yes...

If the bolts are loose, you may find that the holes in the flexplate are elongated. And the threads on the bolts are ate up from being banged around.

 

I like the HG Wells Time Machine pic!

I took the inspection plate off. It took three wrenches: 18mm, 15mm and 1/2". No idea why there are three different bolts holding it on. Then I put a 15mm wrench on the bolts on the flex plate that I could reach and tried to turn them clockwise. I used enough torque that the wheel turned the engine so that's got to be more than 28 ft/lbs. So I would say they are tight.

I trace back all the issue to my starter almost dropping off one day. My wife said the Jeep was making a funny noise when turning the key. I tried and the starter was just free-wheeling (not engaged). I looked underneath and it was dangling from one bolt. Then I had a CPS issue where the Jeep would stall in reverse. I changed the CPS and then the Jeep would start but there's still vibration and it makes the noise like the flexplate video.

Weird.

Thanks for the help.

 

Common denominator here. Transmission to engine bolts are probably loose...............