Question about 1990 Ford F250

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Ford f-250 transmission problem.

I purchased another ford f-250 recently and the trans. will not shift on its own. I have to manualy shift it every time i come to a stop. 1st, 2nd, and O-D. Also i have no overdrive. Well that didn't last long. I have another f-250 service truck that has the same trans. in it, that i new shifted and worked perfectly. I replaced the bad trans. with the service trucks trans. and i still have the same problem as before? I bought 2 books on the truck and they are no help to me concerning this problem. I thought since it work fine in the service truck it should also in the other truck. same trans. both f-250 ones a 1989 service truck and the other is a 1990 f-250 exstended cab. can anybody help shine some light on my problem? Thankyou!!

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  • kyesg56 Nov 13, 2008

    Can someone tell me what a PCM looks like? and where i might locate it at? THANKYOU!!!

  • kyesg56 Nov 13, 2008

    Can someone describe what a PCM looks like? and where i might locate it at? THANKYOU!!!

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  • Ford Master
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The transmission is controlled by the Powertrain Control Module, swap out the PCM from the service truck and see what happens, if that doesn't do it then there is a wiring harness concern, have you run a test for trouble codes yest?

Posted on Nov 10, 2008

  • yadayada
    yadayada Nov 13, 2008

    The PCM is near the drivers foot area, if you look on the firewall in the engine compartment you will see a huge connector coming out, that is the PCM, it is about the size of a school text book.

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