Thread: Trans problem...???!!

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  1. #1 Re: Trans problem...???!! 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by tc300 View Post
    Rpms at 70mph are 2500 after awhile on the highway it does seem to back down to around 2300 after driving for a bit.
    So at 70mph you feel it slip into overdrive every once in a while? The PCM should command the TCC at about 55mph or so.

    If your RPM is around 1900-2100 at 60 mph then you should be in overdrive.
    If RPM is 2300-2500 at 60mph then you are stuck in 4th gear.
    Since there's no DTC then I would assume that the computer isn't commanding the TCC.
    This may be due to a vacuum leak or a bad MAP sensor. Vacuum and MAP sensor are integral to PCM for tranmission control.

    I hope the problem is a vacuum leak or a bad MAP and not the valve body in the transmission.
    It's a CUMMINS Dodge not a Dodge Cummins
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  2. #2 Re: Trans problem...???!! 
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    Quote Originally Posted by Rico View Post
    So at 70mph you feel it slip into overdrive every once in a while? The PCM should command the TCC at about 55mph or so.

    If your RPM is around 1900-2100 at 60 mph then you should be in overdrive.
    If RPM is 2300-2500 at 60mph then you are stuck in 4th gear.
    Since there's no DTC then I would assume that the computer isn't commanding the TCC.
    This may be due to a vacuum leak or a bad MAP sensor. Vacuum and MAP sensor are integral to PCM for tranmission control.

    I hope the problem is a vacuum leak or a bad MAP and not the valve body in the transmission.

    Overdrive works 100% for sure... Just want to know why when i get on it, it doesnt down shift first...
    That is my question
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