I have a 2005 manual tranny Jeep that has been knocking while the jeep is moving, its a physical knock you can slightly feel and hear while moving at low speeds. Particularly while slowing down for a stop. I can't decide if it goes away when you speed up or if it just gets masked by the engine noise. It happens whether I have the clutch in or not. I thought it might be the common flexplate issue, but it seems that it knocks (if its the flexplate), when its stopped as well. I can't do the redneck of stethoscoping with a stick because it only happens while moving.