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1965 GT350 speedo gear

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by Coralsnake, Sep 19, 2007.

  1. Sep 19, 2007 #1
    Coralsnake

    Coralsnake Well-Known Member

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    Need help finding the right one for the 65 Shelby T-10. I guess this is the 389 rear axle....anyone help with a part number? A picture would be most helpful....please.
     
    Last edited: Sep 19, 2007
    Coralsnake, Sep 19, 2007
    Coralsnake, Sep 19, 2007
    #1
  2. Sep 19, 2007 #2
    zrayr

    zrayr Well-Known Member

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    are you looking for the gear inside the transmission (drive gear) or the one that is attached to the end of the speedo cable (driven gear) and slips into the transmission ? The "right" gear will depend on what tire size you are running.

    Z. Ray
     
    zrayr, Sep 19, 2007
    zrayr, Sep 19, 2007
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  3. Sep 20, 2007 #3
    Texas Swede

    Texas Swede Well-Known Member

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    Hi,
    The correct drive gear has 7 teeth and with blue dots
    (27.61" diameter) and 3.89:1 the driven gear should have 20 teeth.
    Please remember that the drive gear should have threads leaning
    right and the driven gear leaning left. Hope I got this right.
    /Bo
     
    Texas Swede, Sep 20, 2007
    Texas Swede, Sep 20, 2007
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  4. Sep 21, 2007 #4
    Coralsnake

    Coralsnake Well-Known Member

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    Thanks Swede, you rock, maybe I can get this monkey off my back yet.
     
    Coralsnake, Sep 21, 2007
    Coralsnake, Sep 21, 2007
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  5. Sep 21, 2007 #5
    Texas Swede

    Texas Swede Well-Known Member

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    Hi,
    If you have other tire sizes or rear end ratios, please use this program to
    calculate the correct driven gear.
    http://www.bgsoflex.com/auto.html

    /Texas Swede
     
    Texas Swede, Sep 21, 2007
    Texas Swede, Sep 21, 2007
    #5
  6. Sep 21, 2007 #6
    Coralsnake

    Coralsnake Well-Known Member

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    Nope, stock blue dots, thanx
     
    Coralsnake, Sep 21, 2007
    Coralsnake, Sep 21, 2007
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  7. Sep 21, 2007 #7
    Coralsnake

    Coralsnake Well-Known Member

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    Bo- MPC lists the "C30Z-A" 6 teeth made of steel and the "C5ZZ-A" a pink 6 tooth speedo gear. Is it one of those?

    NPD sells both a 6 (pink) and 7 (black) both are nylon. Should I still go with the seven teeth on the drive gear?

    :blink:

    They suggest the 6 tooth pink C5ZZ-A on the higher gear ratios.
     
    Coralsnake, Sep 21, 2007
    Coralsnake, Sep 21, 2007
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  8. Sep 21, 2007 #8
    Texas Swede

    Texas Swede Well-Known Member

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    Hi,
    I believe the drive gears you mention are for a Ford Toploader close ratio
    transmission that has 6 teeth or wide ratio that has 7.
    They won't fit an original T10M1. All original T10M1's I have owned
    or seen have had a metal 7 teeth drive gear. My 67 with a close
    ratio T&C transmission has 6 teeth.
    /Bo
     
    Texas Swede, Sep 21, 2007
    Texas Swede, Sep 21, 2007
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  9. Sep 21, 2007 #9
    Coralsnake

    Coralsnake Well-Known Member

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    okay a metal 7 tooth is my goal, thanks. I think I messed that up and the C30Z-A is the 7 tooth steel
     
    Coralsnake, Sep 21, 2007
    Coralsnake, Sep 21, 2007
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  10. Sep 21, 2007 #10
    Texas Swede

    Texas Swede Well-Known Member

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    Hi again,
    I believe you are correct and will need a C3OZ-17285-A
    which is a metal 7 teeth gear that fits a B&W transmisssion.
    Mustang Monthly from May of 1988 has an excellent article
    about speedometer calibration and there they specify the
    above drive gear for BW 4-speeds with 3.89 and 4.11 rear axle
    ratios. If you find a source for these could you please inform me.
    Thanks,
    /Texas Swede
     
    Texas Swede, Sep 21, 2007
    Texas Swede, Sep 21, 2007
    #10

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