Speed reading too high

05 5.9 in my 02 F-250. 4R100 and US Shift Quick 4 controller. Controller reads speed correctly as does the Speedo on the cluster. Smarty’tuner indicates much higher speed and once it indicates 250 MPH (actual approximately 40 MPH) it starts defueling. Not sure where to start but seems like my exam is not getting correct speed input - any ideas?


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