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Chevrolet Avalanche Noise and Vibration

21 messages,  Last post on Dec 03, 2009 at 9:43 AM

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#15 of 21 Avalanche Drivetrain Rattle by krashfreeway Feb 26, 2009 (2:48 pm)
I have a 2003 Z71 Avalanche with 99,500 miles on it. Just recently, I heard a very metallic rattle coming from below the truck while driving. It was at low frequency at low speeds, and increased in frequency until about 25mph, and then went away. I figured it was a heat shield that broke loose, so I looked underneath and everything seems secure. The noise is not made if the truck is being revved in park...only while driving - I think that rules out the cat/exhaust. It happens in 2WD & 4WD. Any body have a similar issue? Replies to this message: erickpl (Feb 27, 2009 9:46 am) jiml3222 (Mar 16, 2009 12:42 pm) erickpl (Mar 17, 2009 5:07 am)
#16 of 21 Re: Avalanche Drivetrain Rattle [krashfreeway] by erickpl Feb 27, 2009 (9:46 am)
Replying to: krashfreeway (Feb 26, 2009 2:48 pm) Why would it rule out the catalytic? My Jeep's catalytic sounds like a can of marbles when driving, but quiet when idling.   Take a rubber mallet to the catalytic. If it rattles, there's your problem.   You may also want to check the various fittings/connections to see if anything is loose. I've had rattles that I was SURE are suspension, but it was just a d-shackle swinging when I applied brakes/gas.   Have you had any maintenance or mods done recently?   -Paul
#17 of 21 Wheel Bearing? by jiml3222 Mar 16, 2009 (12:42 pm)
Replying to: krashfreeway (Feb 26, 2009 2:48 pm) I had a similar issue starting at 106K miles. Sound was heard under 25 mph and was intermittantly more pronounces as I made slow-speed turns. I suspected that it might be a front brake part dragging. I had the brakes inspected. Brakes were fine, but not the wheel bearing on the drivers side. That cost $420 to repair including AAA discount. BTW - any brake jobs I suggest replacing with ceramic pads rather than bi-metalic pads. They are worth their weight in new rotors! Replies to this message: erickpl (Mar 17, 2009 5:07 am)
#18 of 21 Re: Wheel Bearing? [jiml3222] by erickpl Mar 17, 2009 (5:07 am)
Replying to: jiml3222 (Mar 16, 2009 12:42 pm) Durastop pads and rotors. Incredible performance - and from GM.   -Paul
#19 of 21 high speed vibration by boggsy1 Sep 13, 2009 (4:00 pm)
I have an '02 avalanche. It just started moderately vibrating between 63 and 73 miles per hour. Slower is ok and faster is ok. Bought new tires in April and haven't had any problems until now. Jacked it up and nothing seems loose, tires have no bulges or defects on the outside. Alignment? Help! Replies to this message: erickpl (Sep 18, 2009 10:53 am)
#20 of 21 Re: high speed vibration [boggsy1] by erickpl Sep 18, 2009 (10:53 am)
Replying to: boggsy1 (Sep 13, 2009 4:00 pm) Did you get an alignment? If you lifted it, the front wheel camber will be off and will need an alignment or the outer edges of the tires will cup and you'll get vibes.   -Paul
#21 of 21 Wierd Avalanche Noise by roy40 Dec 03, 2009 (9:43 am)
If I apply the brakes and stop with the wheels turned left or right (as at a 'T' intersection) there is a wierd noise like a brake dragging or a locked-up differential. It's wierd because it doesn't make the noise if the wheelsremain straight when stopped. I can then turn them and there's no noise. What gives?

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