Speedometer gear

Discussion in 'Transmissions' started by Johng1970, Apr 4, 2016.

  1. Johng1970

    Johng1970 Member

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    I put 355 gears with a 3 speed transmission, How many teeth does the speedometer gear need to be?
     
    Johng1970, Apr 4, 2016
    #1
  2. 71gold

    71gold Frank Cooper Supporting Member

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    what size tires?
     
    71gold, Apr 4, 2016
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  3. stuarta

    stuarta Member

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    What gears were in it before?
     
    stuarta, Apr 5, 2016
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  4. Johng1970

    Johng1970 Member

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    P 205/70 R 14
     
    Johng1970, Apr 5, 2016
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  5. Johng1970

    Johng1970 Member

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    Don't know. I don't have the rear end anymore. Had to scrap it
     
    Johng1970, Apr 5, 2016
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  6. stuarta

    stuarta Member

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    Was it more? Less?

    It will be trial and error.
     
    stuarta, Apr 6, 2016
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    71gold likes this.
  7. 71gold

    71gold Frank Cooper Supporting Member

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    are you planing on keeping these on the rear?
     
    71gold, Apr 6, 2016
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  8. Hotrock

    Hotrock Rick, an MCCI Member Supporting Member

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    Hotrock, Apr 6, 2016
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  9. Krazy Comet

    Krazy Comet Tom

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    Each tooth added to gear will decrease reading at 60mph by approx 3 to 3.5 mph... By same token each one removed will increase reading by same... Because of the 255 tires I had to switch from orig 20 to a 18T gear to correct reading in my Comet...

    Drive gear on output shaft, tire size & axle ratio are all variables on this rule of thumb...
     
    Krazy Comet, Apr 6, 2016
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  10. Johng1970

    Johng1970 Member

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    yes
     
    Johng1970, Apr 6, 2016
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