As I was finishing mowing today the trans started making a humming noise (like it was low on fluid) and the tractor seemed slower, when i checked it out there was fluid slowly dripping near the tank but it wasn't at the low mark yet. I did notice a constant sound as if wasn't vented (glug, glug?) and also the tank did not feel like it is fastened. I haven't checked it out good yet because it is pretty hot but does anyone have a opinion on what might be wrong.