Ok this may be a dumb question but im gonna ask anyway. In about the last two weeks I have noticed that when my car is in nuetral with the clutch out there is a noise that sounds kinda like a bzzzzz that sounds like its coming from just below and in front of the shifter housing. I have also noticed the occasional drip of something oily to the touch on the garage floor that I think may be from the differential. Are the two related? if I top of the differential should the buzz stop or should i take it into a tranny shop to have a look?