Actually yes it is like when you let the clutch out to fast. Now think of it like that but faster vibration. It shakes the dash a bit sometimes. It doesn't do this all the time, it never bangs or does it in other gears. Could it be that the first clutch is worn? I'd like to do a manual tranny swap, but I have no experience and I have no idea how to put in the linkage and whatnot.