8th 9th 10th gear vibration

I have a 2010 386 Peterbilt with a eaton auto shift and isx. I have a vibration when it shifts into 8,9, and 10th gear. 1000 rpms to 1300 rpms. If you lighten up on the gas pedal the vibration lightens up push harder and it gets worse. I feel the vibration mostly on the floor and it rattles the dash pretty good. Any ideas??

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