Hi all, I'm a Newbie and hope I get all the info out the first time - here goes-
I have a 2004 Trailblazer LT, 4x4, with 55,000 miles running all original equipment with the exception of brake pads and tires. I have a tire hum or something humming at about 20 mph and higher coming from the driver's side front of the truck. At about 37 mph to 40 mph, a vibration noise occurs which I believe to be from the brake disk shield and a high frequency vibration can be felt in the steering wheel. Other than the loud tire rumble and the small vibration, the truck drives well without any shimmy, tire wobble, or veering. Applying the brakes doesn't change anything and nothing can be felt at the brake pedal. Dropping speed down to below 20mph and the noise goes away. Any input would be greatly appreciated.

 

Have you tryed to rotate the tires to see if the noise goes to the rear of the vehicle? Also check the hub bearing on the front to see if there is any movment.

 

I've had the tires rotated and the noise stays up front. I'll check the front HUB bearings for play in the morning. I'll post after if I don't freeze to death first. : )

 

I'd go with the hub/bearing also. Did you notice if the pitch of the vibration/whine increases with speed, or changes a bit when turning the wheel while moving?

I replaced mine at around 40K on a 2000 Blazer 4X4, and have driven over 120K additional without a problem; pretty simple R&R if you're handy with a wrench. Price was about $130 each a few years ago. Auto parts guy said the factory ones were a bit subpar and a common replacement.

 

I ended up going to the garage down the street and had them replace the left side hub and bearing w/sensor. It cost $380.00 but it's done and I didn't have to do it in the freezing, snowy weather. Hopefully, the right side will last until the spring and I'll replace it myself. Thanks for all your help!