humming noise while driving

[Eshua2]

Hello I have a 2003 4runner SR5 V6. It is making a humming/vibrating type noise while driving. I don't really begin to hear it until I reach about 20 MPH. It sounds like the engine revving, however, when I let off the gas the noise continues and will get deeper in sound as I slow down. I came to the conclusion that it was the wheel bearing. I just replaced the wheel bearing and it continues to make that noise. about 3 week prior I replaced both the driver and passenger side axels. Any suggestions for me? Could i have received an axel that had a bad CV joint? Could it possibly be the differential?

 

[runner mike]

I believe I have the same issue. It's definitely a rotational noise/ vibration. I'm not sure if it's a wheel bearing because when I turn left or right the noise/vibration goes away. It only happens when I'm going straight.

 

[runner mike]

You didn't happen to find out what it was did you?

 

[runner mike]

I have an 08 sr5 v6 btw.

 

[runner mike]

I went for a drive yesterday, now it's gone?!?!? Wtf

 

[jackrabbit66]

frozen caliper maybe

apparently frozen caliper is a common problem with the 4runner. When mine froze i had lots of vibration and a bit of noise but mostly vibration in the steering wheel and car. it can be intermittent though. I knew i had a frozen caliper because i could smell burnt rubber & the tire with with the bad caliper was putting out more heat.

alternatively, have you considered it may be a transmission problem?