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2500HD Factory Exhaust Drone

oldspwr

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oldspwr Enthusiast

oldspwr

Posted
Posted

I have an 05 2500HD 4wd Silverado that I purchased new. It's a crew cab with an 8' box. It has the 6.0 in it, auto trans, 4.11 gears and little under 30k miles on the clock. From day one I noticed an exhaust drone or vibration around 75 mph, approx 2600-2700 rpms. If I would take my foot slightly off the gas pedal, the drone would go away instantly. I very seldom drive the truck that fast so I let the problem go for a while.

 

I did some research on the web as well as this forum and found out that GM has exhaust 'drones' that were noises in the exhaust caused by hitting a certian resonant requency. They have a tool which determines they frequency and with that number you could calculate the order of the noise (4th order, etc...) I also realized they solved the problem by clampling 'vibration dampers' on the exhaust in different locations. These are nothing more than clamps with weights attached to them. By attaching the various weights to different locations of the exhaust, the resonant frequency would change.

 

So I finally took my truck to the dealer (under warranty of course) last week and they added the dampeners. Now the drone comes in at 70 mph instead of 75 mph. Since I drive the truck at 70 mph more often, the noise is starting to become a pain in the rear.

 

Has anyone else experienced this problem?

 

Thanks...

 

Tom

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

I have an 05 2500HD but it's the 8.1 and I don't have any drone at highway speed. If it were me, I would just move the clamp (dampner) around and try a few different locations to see if you can move it out of your speed range.

 

DEWFPO

tffd27 Enthusiast

tffd27

Posted
Posted

I also have 05 2500hd with the 6.0 that I just bought, I have not noticed that problem but my stock exhaust has been replaced with a Magnaflow dual system. My exhaust is louder then a stock but is actually at its quitest at highway speeds. But of course if that resonation was at the same pitch as my wifes voice I probably wouldn't hear it anyway.

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