inutero11

alright,1st,2nd,sometimes 3rd...just at low rpms when you let the clutch out it will start making this kinda vibrating noise,push clutch in its gone,go into higher rpms it goes away,,anyoe have any idea what it could be,tranny shifts and does everything fine,its just a vibrating noise it sounds like,but could get loud. is it possible there is to much tranny fluid or to little? thinkwe put a quart and half in it...