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I have driven in DFW area with a 2003 GMC Sierra with 10 plys and with a 2006 Silverado with stock tires. Both are Z71 and I have the same problem with both trucks. I think it is because of the roads in DFW area. The concrete teh way it is poured is not as smooth as asphalt, not to mention the grooves to make even quiet tires on other surfaces make alot of noise.
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