On a related note - as you saw from the pictures I posted, my front axle leaks at the shift motor, and recently (as of about two weeks ago) ive been hearing a pretty noticeable humming sound coming from somewhere around the front axle. I'm running 315/75r16 kumhos and they're about ready to be retired, so I'm having trouble identifying whether the humming is coming from the tires or the differential. I guess the question is: even if the diff is low on fluid, would it hum if the front gears aren't engaged? I don't want the thing to lock up on me going down the road, and I haven't been able to find the time to fix that leak. Any input would be greatly appreciated.