I suspect you're feeling the 2-3 shift and then an immediate torque converter clutch apply at certain accelerator pedal positions (happens when the 2-3 shift happens just above 35 MPH).
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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