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Speedometer gear

Joined
Jul 30, 2010
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Location
New Hampshire
Does anyone know how to figure out how to caculate the number of teeth on the speedometer gear?

I have 19 tooth speedometer gear in a 72 GM 350 automatic
3.9-1 rear axle
255/60R15 tires

my speedometer is way off on my 57 chevy pickup (Reads to high)

trying to figure out what tooth size speedometer gear to change to.

Carl
 
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