From your description, it does sound like a sensor. However, there is also the possibility of a bad connector or a broken or shorted wire in between the PCM and the transmission. This sensor reads the speed of the input side of the transmission. There is another sensor on the output side. The two sensors are compared by the PCM. That is how the PCM knows if the transmission is in the gear that it has commanded. Since all of the gears are there, it would seem to eliminate the possibility of a mechanical failure. The component that corresponds to the sensor is a toothed wheel on a part that is directly connected to the input shaft (turbine shaft). If that were not turning, the transmission would not move the truck. I suspect that your problem is either that you have replaced the wrong sensor or that there is a break in the wiring between the trans and the PCM. Recheck to see that you have replaced the correct sensor.
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