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Re: 01 2500HD vibration between 70-80mph
There is a TSB out for frame "beaming" at a certain speed range this could be what you are feeling. The TSB says it more common in HD models than non HD models. It basically says there is a harmonic resonance through the frame and is felt in the cab. I have the same vibration only between 40 and 50 with 45 being the worst spot. Hope this sheds some light on the situation.
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2009 Z-71 ECSB
2007 Yamaha Grizzly 700 FI
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