Humming sound at higher speeds

SOURCE: 01 venture has a whirring

have your wheel bearings checked ,, does it go away when u take a turn ?

SOURCE: 2003 envoy, low speed harmonic vibration in front end

hello have u rotated the tires front to rear then drive and see if u still have the noise and vibration if drive yes while driving slowely turn the steering wheel left to right just a small amount if the noise changes its probably a front wheel bearing if that doesn.t help drive the truck till you get the vibration then let up on the gas pedal does the noise go away if so you might have a bad u_joint but do the tires first how many miles???????

SOURCE: I have a 1999 tahoe that shuders around 70 mph, at

it could be the bearings in your transmissin. or you need an alignment

SOURCE: 3.8 Impala w/ vibration issue on driver side. Low

Bad wheel hub bearing.

SOURCE: I recently purchase a 1986

You may be listening to a slightly noisy differential or the Tyre's....If they are off roader's they sometimes buzz....To check the diff keep it in gear and give normal gas when descending a hill and then, with the vehicle in gear lift your foot from the gas pedal....If the noise increases to any notable degree, its the diff....You can carry out the same test by disconnecting each of the shafts in turn and repeat the test....When testing the front diff, don't forget to engage the 4X4 drive or you wont go anywhere....You've said the sound is not high in volume, I'd think you can leave it...As an after thought have you checked the oil in the transfer case? Its not the same as the gear box and has a separate filler?.