i have a 95tbi with a 4l60e trans.. it has a 40 tooth reluctor ring and the screw in style speedsensor.. truck shuts off at 45mph... while test driving with a snap on scan tool monitoring the vehicle speed PID the vehicle speed says 104 mph when im only going 45... which is causing the ecu to shut the engine down due to over speed... anybody have a idea what could cause this??? the air gap between the sensor to small??? is the drac not programmed correct..(ive swapped with a tuned drac and still does it) let me know if any body has an idea of the cause

Got it in 4 lo?

or 4x4 switch stuck on.

Does the computer think it's in 4 lo? 104mph/2.76=37.68 mph.