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Q&A

DRONING ON AND ON

I have a 2007 Chevy 2500HD that is producing a drone/vibration that can be heard and felt. All this seems to worsen at freeway speeds. I have installed new motor mounts and a transmission mount with no change. It sounds like a diesel with a straight pipe on it. This truck has accumulated 50,000 miles and is all stock. I checked the exhaust system and found no part of it touching a chassis or powertrain component. I can feel the vibration in the front tires, the exhaust system and the body, but when I touch the frame rail it’s a very light vibration. The drone seems to be coming from high on the engine and is more pronounced at the top of the shift points. I can also feel the vibration in the air filter box. Has anyone experienced anything like this?

Mike Mog Via Email

Duramax’s have drone issues with many aftermarket exhausts. The noise usually happens at a certain fixed RPM and the fix often means a new exhaust system must be installed. However, if you’re certain it’s not the exhaust, have you eliminated the front wheel bearings as a possible cause of the droning sound?

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About Diesel World

May 2020