I bought a used TT last year. I know that's not smart but it was a family deal. Anyway, it had a bad vibration. My brother hd taken it to the dealer and they said there was nothing wrong with it. The dealer is an idiot. The oil drain had vibrated enough to wallow out and the radiator tried to fall off every time I used it. I finally narrowed it down to the pto shaft and replaced it. It was fine for most of the year but now it's shakin again. I think it's a horrible design to run a shaft and a gearbox. Three problems: 1, together they are $700 to replace, 2, they are prone to vibration, and 3, they rob too much power. No more TT's for me. Only belts from now on.