Popping Noise From Muffler Heat Shield on Chevrolet Silverado 1500 HD

The muffler heat shield may become loose on the muffler causing a rattle or popping noise. Our technicians tell us there is a kit available from GM to correct this problem.

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Average mileage: 71,077 (63,233–78,000)
8 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007, 2008
10 people reported this problem
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problem details
rattiling nosie where muffler is
I am having a rattiling noise close to where the muffler is? anybody know what that might be.