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Jumping speedometer help please! 1994 lightning

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  • #1

    Jumping speedometer help please! 1994 lightning

    I’ve noticed my 94 lightning here lately has the speedometer needle jumping. It’s not real bad just a twitch and on the bad days it will jump off zero while making a complete stop. How do I fix this? I’m thinking a new speedometer cable? Or are these trucks digital?


    Thanks…
    Tags: None
  • #2
    IIRC there is a speedo plug on the top of the back of the rear end housing that needs to be replaced or cleaned. I think LMR carries them of you need a new one.
    Originally posted by Silverback
    Look all you want, she can't find anyone else who treats her as bad as I do, and I keep her self esteem so low, she wouldn't think twice about going anywhere else.

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    • #3
      Originally posted by Rick Modena View Post
      IIRC there is a speedo plug on the top of the back of the rear end housing that needs to be replaced or cleaned. I think LMR carries them of you need a new one.
      Highly likely. OEM ford would be the best bet.
      "If I asked people what they wanted, they would have said faster horses." - Henry Ford

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      • #4
        The sensor itself in the center/top of the differential may have some metal filings on it or be bad. I believe that is what's being referred to above rather than the connector.

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        • #5
          Originally posted by Rick Modena View Post
          IIRC there is a speedo plug on the top of the back of the rear end housing that needs to be replaced or cleaned. I think LMR carries them of you need a new one.
          Originally posted by shumpertdavid View Post
          The sensor itself in the center/top of the differential may have some metal filings on it or be bad. I believe that is what's being referred to above rather than the connector.

          thanks! i had my rear end rebuilt last year because my differential took a dump

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          • #6
            what is this?




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            • #7
              ^^^
              That is the VSS, but it is not the rear end sensor.
              Originally posted by Silverback
              Look all you want, she can't find anyone else who treats her as bad as I do, and I keep her self esteem so low, she wouldn't think twice about going anywhere else.

              Comment

              • #8
                I believe its this one, but don't quote me on it, may need to take it out and take it down there.

                http://www.oreillyauto.com/site/c/detail/PTQ7/TE142/03247.oap?year=1993&make=Ford&model=F-150&vi=1122118&ck=Search_03247_1122118_3919&categoryRedirect=03247&pt=03247&ppt=C0033
                Originally posted by Silverback
                Look all you want, she can't find anyone else who treats her as bad as I do, and I keep her self esteem so low, she wouldn't think twice about going anywhere else.

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                • #9
                  Sounds like a total loss. Give you $1000.

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                  • #10
                    Originally posted by Rick Modena View Post
                    I believe its this one, but don't quote me on it, may need to take it out and take it down there.

                    http://www.oreillyauto.com/site/c/de...3247&ppt=C0033
                    thanks

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                    • #11
                      Nick on the excitor ring in the differential.

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