Re: Electrical Buzz
Well if it's not the Fuel Pump, probably time to put the brake on, chock the wheels, and slide under to find it. If it only happens when engine running, could still be a mechanical resonance from exhaust system or something.
Also, if you have push-button 4WD shift, there is that shift motor on the back of the T-case. If for some reason it's stuck, and the limit switches are telling it to run, it might buzz, I'm just guessing there. Does 4Hi and 4Lo still work? Might want to see if it is buzzing first, before shifting it, or your evidence may disappear. Tapping it with a hammer may help free it up. Just a thought.