Question about 2005 Chevrolet Silverado 2500HD 2WD

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I have a 2500 HD 4x4 with 160,000 miles, between 65 and 70 mph there is a roaring sound coming from the truck. I can not determine where it is coming from. I can coast at 65-70 mph with no roaring but under power it will roar. Above 70-72 mph it stops roaring and sounds normal. I have checked the dope in the rear end and it is fine. Any suggestions?

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Try the cooling fan its controlled by a thermo clutch,check it out.go online they tell you how.or if the fan free wheels to easy it likely is defective.

Posted on Oct 05, 2010

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