Good Vibrations... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*JCampbell* · 11-19-2008, 02:17 PM

Thursday night I developed a nasty little vibration that is causing me some concern. At about 30-35mph, the dually starts shaking like I'm doing 90mph down a washboard road. It doesn't subside with increasing speed. It will only stop if I slow to under 25mph, or so.

My initial thought was that the harmonic balancer went bad, but when I got home and checked, it was a-okay. So I just parked it until I figure out what's going on. I have a few ideas, but I want to keep them to myself so as not to suggest the problem.

So how 'bout it? Anybody have any ideas on what the culprit may be?

11-19-2008, 02:17 PM	#1
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Good Vibrations... Thursday night I developed a nasty little vibration that is causing me some concern. At about 30-35mph, the dually starts shaking like I'm doing 90mph down a washboard road. It doesn't subside with increasing speed. It will only stop if I slow to under 25mph, or so. My initial thought was that the harmonic balancer went bad, but when I got home and checked, it was a-okay. So I just parked it until I figure out what's going on. I have a few ideas, but I want to keep them to myself so as not to suggest the problem. So how 'bout it? Anybody have any ideas on what the culprit may be?

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