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Thread: Need Help Speedo off like 20mPH or more
          
   
   

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  1. #16
    Henry Rifle's Avatar
    Henry Rifle is offline CHR Member Visit my Photo Gallery
    Join Date
    Apr 2004
    Location
    Little Elm
    Car Year, Make, Model: 34 Ford Low Boy w/ZZ430 Clone
    Posts
    3,890

    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

  2. #17
    Novacane's Avatar
    Novacane is offline CHR Member Visit my Photo Gallery
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    Jul 2005
    Location
    Fremont
    Car Year, Make, Model: 1971 Chev Nova
    Posts
    9

    Thanks for your help!!!!!!

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