Choosing a Speedometer Gear ...

Discussion in 'Technical' started by dmhines, Apr 18, 2004.

  1. dmhines

    dmhines Dixie Maverick Boy

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    Got the formula ...

    Driven Gear = (Drive Gear Teeth * Axle Ratio * Tire Revolutions per mile) / 1000

    How can I tell how many drive gear teeth my Tranny has? It is a Toploader ... do Toploaders have a standard number of teeth?
     
    dmhines, Apr 18, 2004
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  2. BlkWlf1968

    BlkWlf1968 Member

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    I think they all use a simular gear for the speedo. I know dealership has up to a 21 tooth in stock, but bigger is an aftermarket deal. The local speed shop here has them, but you might check Tranny shop for them as well.
     
    BlkWlf1968, Apr 18, 2004
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  3. dmhines

    dmhines Dixie Maverick Boy

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    Well I have been researching and found out they have either a 6 or 7 tooth gear. They are color coded so I guess I gotta take a peek in the hole and see if I can see it. I need either a 16 or 19 tooth gear depending on the color I find ...
     
    dmhines, Apr 18, 2004
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  4. Max Power

    Max Power Vintage Ford Mafia

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    Usually the 2.75 to 3.50 equiiped cars have a 7 tooth drive, and 3.50 to 4.11 cars have 6.

    Usually.
     
    Max Power, May 1, 2004
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  5. courier11sec

    courier11sec Member

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    color code.

    Which color is which tooth count?
     
    courier11sec, May 1, 2004
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  6. 74MAV

    74MAV Gearhead

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    I did not know that they could get them through the aftermarket but I put in the biggest one that Ford had available and I am still 4-5 mph off. I think the color mine is was purple or maybe blue been a few years since I changed it but the original was a white color
     
    74MAV, May 5, 2004
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