You may have loose hub bearings. My wife hit a curb and jerked the alingment out. This went unoticed for awhile then the hum got real bad. Take it to a tire shop and have them check for loose wheels. If the bearings go out the car will go one way and the tire will go another. NOT GOOD!!
Certain types of tires may cause a brief humming noise after your initial acceleration. The transmission may also cause a brief humming noise.
CHECK YOUR LUG NUTS
newdiv vacuum leak, cat. converter comming apart, exhaust noise
Transmission mount
the humming noise is coming from a bad ground on you stereo
did you ever get the noise figured out?, mine just started doing the same thing today
is the humming coming from the front end of the vehicle? i have a 1996 explorer with the same issue. yes the noise come from the front but not all the time seems to make the humming noise when it gets hot
If a car has a loud humming noise when accelerating, it could be that the air filter is missing. The air filter housing might also be loose. A loud humming noise can also be a signal that there is something wrong with the alternator belt or the fan belt.
where is the humming noise coming from? if it's coming thru the speakers and matches the rev tone of the engine, then you have a bad ground in your stereo.
sounds like a motor mount is broken or a transmition mount. have those checked.
A hummingbird
wheel bearing