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My truck is a Dodge Dakota 4x4, auto transmission, 4.7L V8. I recently had a new/rebuilt engine installed which I bought from PowerTrain Products. It has never done this prior to the engine replacement. I do not suspect that had anything to do with the engine replacement as I had driven the truck over 6,000 miles with no problems since the new engine was installed. Other than a rear main seal leak with PowerTrain Products paid most of the labor on to replace the new seal. The truck itself has about 195,000 miles on it. Since then it has quite running two times, once at 70 mph, and once at 25-30 mph. The Engine Light came on both times. It restarted both times within a 2-5 minutes. Both times when restarting and driving first thing I noticed low (1st) gear and overdrive did not work. The engine runs great when this has happened. The two have been about 2 months and about 1,000 miles between each incident. I have an Actron Autoscanner Plus. Both times I ran it and got code P0725, and Engine Speed Sensor Mod, and the part cost (lol). I cleared the engine light and restarted the truck, and it ran fine. Both times the transmission worked fine and normal once I cleared the engine light. Until the engine light was turned off the transmission would not work in low and overdrive. The first time I drove it about 60+ miles in second gear, had no choice due to my being in a remote location. I think i have narrowed it down to the Crankshaft Sensor and or the Transmission Controller. I am leaning toward it being the Crankshaft Sensor. Can anyone help me figure this out and or tell me if I am figuring correctly and should change the Crankshaft Sensor. I am confident in my mechanical abilities. I need my truck and travel the Sierra Nevada Mountains a lot. i have to make a trip day after tomorrow to the VA hospital in Northern Nevada for an outpatient treatment and again in one week. Winter is here in the Sierra's and I will be traveling in the snow Thursday and possibly Friday. Today is 11/27/2018

Vehicle: 2000, Dodge, Dakota, 4.7L
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12/02/2018. I replaced the Crankshaft Sensor, drove the truck 500 miles and problem is gone, for now. All that I listed as problems has been a intermittent problem for some time. I will be using the truck a lot over the winter and we'll see how this fix holds up. For quite a while, like years, I had a problem with the overdrive off and on button. When I pushed the button for overdrive on or off it would not always work. If I pulled back on the shifter arm and held the button down it would work. I had it checked a couple of times and was repeatedly told that it was a short in the wiring of the overdrive button and or within the shifter arm and steering column, and that I would need to take the steering column apart to repair it. Well guess what...that problem also disappeared since I replaced the Crankshaft Sensor! I have also noted a difference in how the truck drops down into passing gear. It is much smoother and does not down shift into passing gear at lower speeds like it was and didn't need to. So, it appears that the signal it sends to the Transmission controls does more than I originally thought, or that my repair manual described in the trouble shooting guide. I will come back and make more comments if anything comes up. In the mean time if you are having problems as I was, think "Crankshaft Sensor", or Engine Speed Sensor as my Actron Code Reader described it.

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