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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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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