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2003 Chevy Avalanche Drivetrain Rattle

Tiny
KRASHFREEWAY
  • MEMBER
  • 2003 CHEVROLET AVALANCHE
  • V8
  • 4WD
  • AUTOMATIC
  • 99,500 MILES
I have a 2003 Z71 Avalanche with 99,500 miles on it. Just recently, I very metallic rattle coming from below the truck while driving. It was a 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?
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Thursday, February 26th, 2009 AT 4:36 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Have you taken a rubber mallot to the exhaust?
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Monday, March 23rd, 2009 AT 5:01 PM
Tiny
KRASHFREEWAY
  • MEMBER
  • 2 POSTS
You think its the cat? I though about it but haven;t done anything about it yet. I did find out that my u-joint's trashed though
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Wednesday, March 25th, 2009 AT 2:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi:
If the u-joints are bad, I would start with them. They could cause that noise. As far as the converter, sometimes the guts in the converter break loose and rattle. Not only is it a pain, it can cause engine trouble.

Let me know about the u-joints. If they are that bad, chances are that is the problem.

Joe
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Wednesday, March 25th, 2009 AT 8:48 PM

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