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Old 09-02-2005, 07:47 PM
Jimmy Neutron's Avatar
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Speedometer calibration

I have a 1970 Camaro with a TH 350 transmission.
I have changed the rear gears and tires and want to calibrate the speedometer.The speedometer is KM.

4.10 gears
tires 255/60r15
drive gear 7 teeth

The formula said I should use a 21 teeth driven gear.

My problem is that the car is originaly equiped with a reducer between the speedometer and the transmission and I don`t know the ratio.

Can I use the formula and use the 21 teeth driven gear?

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Old 09-02-2005, 11:50 PM
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Reducers I have seen have had the ratio stamped on the outside. It's usually stamped very lightly, so it's easy to overlook.
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Old 09-03-2005, 03:02 PM
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Today I have put the 21 teeth driven gear in and the Speedometer worked great.

thanks for the reply
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