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Thread: How to fix your speedo the factory way ...

  1. #31
    Kamber King Conversion King Negative Boost's Avatar
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    Default Re: How to fix your speedo the factory way ...

    Just letting everyone know that you can tell what gear you have by taking it out of the gb and checking the top of the gear. It has the starts and teeth imprinted on top of them. Here's a picture of the two i have.


  2. #32
    king & queen of cheese Domestic Engineer lilcrash's Avatar
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    Default Re: How to fix your speedo the factory way ...

    sorry to bring this back up but ive gotten myself confused. im trying to use the excel spread sheet calculator. is the speedo cable revs the ratio i need to find? by that i need am 11x23 to get as close as possible to the right number and then i can just get a smaller tyre for the rest.

    does anyone know a part number or how to find the part number of the 11x23 gears set?

    also thats assuing my dash is 1024 rotations per mile. my car is a 68 corona. 4.1 diff and w50.
    Last edited by lilcrash; 31-05-2015 at 06:34 AM.
    Looking for a new toy. If you have something 18r powered let me know.

    RIP, where ever you are :- 1974 celica, 3tgte and 186.5hp at 6500rpm

  3. #33
    iconoclast Backyard Mechanic Youngy's Avatar
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    Default Re: How to fix your speedo the factory way ...

    Holy thread revival.

    I just went through this process:

    1891.176 mm diameter

    AE86 - 637revs = 1 KM

    1.891176 metres (wheel diameter)
    axle revs: 1000/1.891176 = 528.77
    output shaft revs: 528.77 x 4.80 = 2538.096
    required speedo cable revs: 2538.096/637 = 3.984

    6 x 24
    5 x 20

    Which would mean basically an 36\9 drive gear.

    I have not been able to find if that exists though so far. I did find these listings:

    33403-29105 = 30:11
    33403-29145 = 31:10
    33403-19245 = 31:11
    33403-29125 = 32:10
    33403-19255 = 32:11
    33403-29115 = 33:11
    33403-29135 = 33:10
    33403-39075 = 34:10
    33403-19235 = 35:10
    Oh really...

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