Since the PCM controls automatic upshifts and downshifts then yes, a bad VSS (or related wiring) can cause a lot of problems. It is located on the top of the axle housing right above the ring gear in the center section.
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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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