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Auto transmission overdrive issues please help!

Discussion in 'Engine & Performance' started by Flat black, Dec 2, 2019 at 7:52 PM.

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  1. Flat black

    Flat black Junior Member

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    I have 1992 dodge cumming with an auto trans and it won't shift into the last gear of the transmission. It has high enough rpms and shifts into the other gears perfectly. I would appreciate any suggestions or thoughts to why it's doing this or how to fix it. Thanks.
     
  2. reek

    reek Senior Member

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    could be your valve body is gunked up or possibly your OD shift solenoid. You could drop the pan and give it a quick clean, it's pretty simple and straight forward. just use a big table and keep track of all the small parts and what order they go in. I washed my valve body in gasoline and a bunch of 'silt' came out and it looks like new.

    at the same time look at the filter and check the magnet see how much metal debris you are collecting. Also the snap ring on the a518 are know to break apart. that might be causing the shift issue as well. you'll probably find parts of the ring in your pan as well. You'll need a new pan gasket, I think they were still using cork in 92.
     
  3. Flat black

    Flat black Junior Member

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    Thx for the info will have to try that
     
  4. crazzywolfie

    crazzywolfie Senior Member

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    have you checked the trans temp sensor? i think you need to jump it to bypass it but if it is not working properly it will prevent overdrive from being powered.
     
  5. Flat black

    Flat black Junior Member

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    Where is that located? Internal or external?
     
  6. crazzywolfie

    crazzywolfie Senior Member

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    should be on one of the transmission lines under the truck or at least that is how it was on my buddies truck.
     

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