This problem IMO is one of 2 things:
1. Seeing as Selena Gomez is on top of the page and it's the 1st of April, you're pulling our leg and your car is actually fine. I hope this is the case.
or 2. Clutch/Flywheel defect. You lost a balancing weight, a piece of the clutch disc broke off or one of the pressure plate fingers is damaged (unlikely). All of these wouldn't show visual signs threw the peep hole in the trans, probably not much more noise and possibly wouldn't affect the Crank Sensor as it would only offset the weight on one side affecting the centrifugal force and not the rotational speed of the engine. Add the extra stiff mounts and you get a pleasant shutter in the car that is worst at certain RPMs (frequencies).
I would pull the transmission, specially if you have access to a lift and a transmission jack.
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