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Thread: speedometer way off

  1. #1
    Registered Member
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    Apr 2012

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    speedometer way off

    I am using the original speedometer and cable on my 55 wagon.The trans is a 350 turbo. The speedometer is showing way faster than the actual speed.Is there an adapter I need to use or do I need to change the gear in the trans.?

  2. #2
    Registered Member Run-em's Avatar
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    Mar 2012

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    Change the speedometer gear in the transmission.

  3. #3
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    Thanks,that was what I was thinking..

  4. #4
    Registered Member chevynut's Avatar
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    Nov 2011

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    Check out this site...there is an excel spreadsheet to help you choose the right speedo gears, and they sell them too.

    http://www.performanceautomatic.com/...ter-gears.html
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  5. #5
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    Member #:625
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    [QUOTE=dans55;2178]I am using the original speedometer and cable on my 55 wagon.The trans is a 350 turbo. The speedometer is showing way faster than the actual speed.Is there an adapter I need to use or do I need to change the gear in the trans.?[/QUI

    If you have a 3.55 gear in rear and your tire is equal to a G70/15 in height go to dealer and buy speedo gears for a 78 Corvette equipted like prevously stated. That is how I got 9it right.

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