Hello everyone. My 2001 chevy blazer has been making this humming noise recently. Sounds like it's coming from the front end. It gets really loud when the vehicle slows down and can hear it when accelerating up to a point. I only notice it when in 2HI. Doesn't really seem to make noise when 4High is activated.

I think it might be a bad wheel bearing. I'm including a video and was hoping to get some advice.

The video is posted below, thanks for your time and advice.

 

One thing to do is to lift up the front end and see if there is any slop at all in the bearing. It should be near undetectable. They eventually do wear out. I replaced mine at about the 120k mile point.

Also, you should inspect your tires. If they look ok, rotate them front to back and see if the sound changes from where it seems to come.

 

Did you ever find a resolution to this? I've found mentioned in several threads, but no one has posted a fix. I have a 2001 GMC Jimmy that occasionally does the same thing. Flip it to 4Hi and the noise immediately stops.Can go back to 2Hi and noise is also gone. Very sporadic. I am just now trying to research cause/repair. If anyone has more info or a potential fix, would greatly appreciate the input. If I figure anything out, I'll do the same.

I also replaced the front hub assemblies, figuring it couldn't hurt and at least I know a good starting point from there. New CV Axles as well.