Speedometer is off, causes?

Discussion in 'Tech Info' started by Dad's 1990 Ram, Dec 16, 2014.

  1. Dad's 1990 Ram

    Dad's 1990 Ram Junior Member

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    Joined:
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    Location:
    Kanabec County Minnesota
    Ram Year:
    1990
    Engine:
    318ci V8
    1990 3/4 ton 4 wheel drive with an automatic transmission.

    I have stock 8-bolt steel rims and tires, the tires are the same size as indicated on the door jamb sticker.

    The speedometer reads 5mph slower than actual speed.

    While driving 55mph using the speedometer my GPS indicates I am actually traveling at 50mph.

    Any thoughts on what needs to be done to make this accurate?

    Thanks for any help you throw my way.

    Steve
     
  2. crazzywolfie

    crazzywolfie Senior Member

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    5.2
    is it 5mph off all the way from 0 up? mine is the same way. no one seemed to really be able to give me an answer. since it will prevent people from speeding in my vehicle i look at it as a good thing.
     
  3. Dad's 1990 Ram

    Dad's 1990 Ram Junior Member

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    Joined:
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    Location:
    Kanabec County Minnesota
    Ram Year:
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    Engine:
    318ci V8
    Yep, whole way up.

    Thanks for chiming in and letting me know you have a similar issue and no one knew what the cause was.
     

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