Don't know if it's the driveshaft or something in the clutch but around 2500 rpm hard vibration and a noise clangy type. Trow it in neutral it does it still but sitting and idling revving it up does not do it..any hints or any input greatly appreciated. Oh recently rebuilt t5 just put a bell housing this past weekend.. the vibration is at it's worst on deceleration as in putting in neutral