wheel bearing
countershaft bearing could be problem
If the noise gets louder with speed, it is possible that the bearing in one or more of your wheel hub assemblies have failed. The noise will also become more pronounced during steady state corning.
Sounds Like The Front Bearing/s Is/Are Bad
If the grinding sound seems to be coming from the speedometer and grinds faster as your speed increases, the likely cause is the speedometer cable. At least some 1990 Dodge trucks (mine) have electric speedometers Len
If it is a manual trans then it sounds like your not pushing the clutch in all the way. When you dont push the clutch in all the way then you will hear your gears grinding when you go to shift
It is probably a worn blower motor, because it happens with AC, and/or HEAT. When you brake or speed up, you are changing the speed of the motor (adding and taking away resistance to it's spinning). This will cause more of a noise until you reach your cruising speed again.
This is more than likely a rear wheel bearing/hub. Is the noise related to road speed? If the noise gets louder with increased road speed, then the problem is almost always a wheel bearing/wheel hub. Terry Naber Naber Automotive Inc
Bad wheel bearing.
I have heard that if you have papers or napkins in the glove compartment box they can get sucked into the air vent which then makes a humming noise that you can hear while driving and as you increase the speed the pitch of the noise gets louder.
noise comes from the high speed higher the speed, louder the noise it can be checked with this https://itunes.apple.com/us/app/washspeed/id588527777?l=it&ls=1&mt=8 https://www.youtube.com/watch?v=sFl9HOf2nwQ
If you're talking about from the wheels, higher or lower in pitch with speed, it's one or both front wheel bearings. If you're talking about from the engine compartment, it's the power steering pump.
Speed shifting, grinding gears,drifting, and some horrible drivers.