Noise from front end at exactly 40 mph 2008 trailblazer

SOURCE: 03 Trailblazer Front End Noise/Vibration

I had similar problem with my 03 trailblazer. It had a low dull hum in the front end with a little vibration being felt in gas pedal. Noise increased over a couple weeks and was louder turning to the left and quiter turning to right. A GM mechanic friend of mine replaced the front right hub and took care of the problem. Hub was about $160 at Autozone.

SOURCE: 98 chevy astro front end vibrates and shakes at 65 mph

BUSHINGS! Your bushings need to be replaced. It is probably worse if you are in a turn at 65mph, too.

SOURCE: Vibration in the front end when you get to 25 mph

Could be many a things, for example:

Front wheel bearings
Warped Brake Disc
Worn suspension mounts
CV joint needs replacement
Worn bushes
Worn/bent steering rods
Wheel weight balances have come off and caused irregular wheel balance
Wheels are warped, damaged
Brake pads are worn over the limit

I would really recommend you take it to a professional to take a look. It could be very dangerous to you and other drivers using the road

SOURCE: Grinding noise, metal to metal noise in front end

Get your truck up in a rack and take a look at the drive shaft, the differential, the u joints and the ball joints. Regards, joe

SOURCE: I have a 1999 chevy silverado 1500 and I am

If the tires are round once checked on a balance machine to be true. Next check the driveshaft is a weight missing, dings or bent, u-joints loose?

Then check the rear ring