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Re: 01 2500HD vibration between 70-80mph
You need to narrow it down for us.
Between 70 and 80 when it vibrates:
does it stop if you knock it in N?
does it only vibrate while on the gas?
What happens when you coast at those speeds?
While at that speed, pull it down a gear and see if the vibration speeds up or stays the same while keeping the speed at a higher RPM
Most high speed vibrations come from the tires. Try rotating them and see if the noise changes.
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