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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Speedometer Gear

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Old Mar 25, 2011 | 01:12 PM
  #16  
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Originally Posted by zenmaster
mjshagnasty,

I'm no math genius, but it seems to me that if your speedo is reading low you would want a smaller diameter (less teeth) driven gear. Please correct me if I'm wrong. My other concern is that Ford may not have anticipated people putting tires of that size (35's) on the truck. Consequently, the smallest (16 teeth) may still not be small enough to correct the speedo error.

Just my 2 cents...

John
I agree with you on smaller no. of teeth on gear to correct speedo. I think the 16 tooth gear would get him fairly close.
 
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Old Mar 25, 2011 | 06:48 PM
  #17  
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old tire dia. x old speedo gear Divided by new tire dia. = new gear
 
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Old Mar 25, 2011 | 06:50 PM
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Yeah I could n't fiqure out how to type that as a formula. But 16 tooth should work. RKD.
 
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