My 2008 Trailblazer Has developed a noise in the rear end the noise starts at 60 mph and goes away when you let of the accelarator and stops also when your speed is blow 55mph. It sems to be coming from the passenger side rear wheel. I have had it to the dealer where i bought it used in october 2010 they had it for two weeks and with the help of GM technical made some changes then said it was road noise. The noise is still there.

SOURCE: 2006 Chevrolet Uplander LT 2wd bad road noise in the rear end

Seems like you have a bad DEALER. Because dealers are factory trained and have access to the latest bulletins and prelim information (THAT ISN"T AVAIL ANYWHERE ELSE). If they can't fix a problem or verify it, they have the ability to call GM engineering and speak with an engineer about the problem and get advice where to look. Coming online and saying that you have a noise from the rear while driving could be a hundred different things. GO to the GM Dealer, take a test drive WITH a technician. Its a 2006 its under warranty, and it is THEIR job to find the problem. If you aren't satisfied with the dealer, call customer assistance. Once customer assistance contacts them im sure you will get alot more help.

SOURCE: Humming noise in front end of truck

I'm having the same problem with my 2006 Chevy 2500 duramax...The humming starts at 25mph and then gets less prominent and then at 50mph it gets more prominent and louder, then at 60mph you can hardly hear it.....I did notice a little bit of leakage where the front axel meets the from diff on the drivers side.
Any suggestions?

SOURCE: Rear wheel Alignment

Other than going to the service desk and blowing a hemorage, You can contact GM customer service and see if they will help. Otherwise, find out where rear camber adjustments are and change it yourself. It. usually is not too difficult.

Dave C

• 1050 Answers
• Posted on Mar 12, 2009

SOURCE: Noises problem 2006 Chevy Cobalt 4 cyl Front Wheel Drive Automati

Wow, sounds like a good one, my only suggestion would be, try changing or machining the brake rotor and double checking to make sure all the caliper hardware is torqued up tight. Possibly a tire? Try switching side to side.

Jerry Koski

• 443 Answers
• Posted on Apr 22, 2009

SOURCE: 1994 Chevy Astro has two distinct noises. AT 40

Hey First thing I always look for is cheapest thing to repair or look at .. Make sure your tires are not cupping .. or make sure they are wearing good and smoothe all the way around .. this can make a terrible noise if they are cupped or worn improperly.. then I would Jack up one side and shake the rear wheels make sure those bearings are tight feeling .. you should be able to tell if they are loose this way ... I dont know how many miles are on your van but usually the drive line is not the problem.. this is probably last thing you need need to shake and see if there is play in it.. Holler if you need more and thanks Jerry