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Thread: Need Help Speedo off like 20mPH or more
          
   
   

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  1. 07-18-2005 10:37 AM #16
    Henry Rifle's Avatar
    Henry Rifle
    Henry Rifle is offline CHR Member
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    Car Year, Make, Model: 34 Ford Low Boy w/ZZ430 Clone
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    Just a note. A speedo is never off by a fixed amount. Remember, at 0 mph, it's right on. At 100 mph, it's way, way off. You have to calculate the correction by the ratio of the gears in the speedo compared to the differential gears and the tire diameter.

    A good trans shop can give you the right skinny. I had the same problem in my Vette when I changed from 2.whatever to 3.55. The trans shop sent me a drive and a driven gear. I plugged them in, and everything was fine.
    Jack

    Gone to Texas
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  3. 07-22-2005 05:48 PM #17
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    Novacane
    Novacane is offline CHR Member
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    Thanks for your help!!!!!!
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