Question about 1991 Ford F150

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I have a 1991 ford f150 351w automatic with overdrive

When i take off the transmission will not shift untill i let off the gas and varely excellerate it seems you have to force it to shift then it shifts most of the time all the way to od and when you try to give it more excelleration it jumps all the way back to 1st but once you get up to 50 or more it seems to be fine what could be the problem?

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  • dougservices Jul 21, 2009

    This transmission does not have an external modulator valve nor passing gear cable I believe it is electronic shift

  • dougservices Jul 24, 2009

    The Transmission doesnt have external modulater valve nor a passing gear cable I think it has a electronic shifting module but I dont know much about this or where its located

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  • 108 Answers

It seems the vacuum modulator could be faulty or the throttle preasure cable has slipped and is out of adjustment.

Posted on Jul 21, 2009

  • curtis  rollins
    curtis rollins Jul 26, 2009

    Another cause could be that the internal governer is leaking preasure or sticking.


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