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1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

Speedometer Drive Gears

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Old Mar 8, 2008 | 11:03 AM
  #16  
matt2491's Avatar
matt2491
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Laughing Gas
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Hey, thanks a lot.

It says I need a 22 teeth driven gear, but naturally Ford only has 20, 21, and 23 teeth gears...

Would it be better to go one up or one down?
 
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Old Mar 8, 2008 | 11:05 AM
  #17  
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I "think" the 20 tooth is the closet match to your 8 tooth drive gear. Maybe someone else will chime in.
 
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Old Mar 8, 2008 | 11:12 AM
  #18  
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matt2491
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Laughing Gas
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20? Are you sure?

I put in all my info and it came up with 22.39289853004139 teeth... Why would I go with 20 if they offer 21?
 
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Old Mar 8, 2008 | 11:45 AM
  #19  
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No I am not sure . Thats why I put "think" in quotes. Logic leads me to believe that the gear needs to have an even number of teeth to run on a 8 tooth drive but, it could be acceptable with plastic speedo gears.
 
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Old Mar 8, 2008 | 11:54 AM
  #20  
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matt2491
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Thanks for the help, Banjos.

I just think it wouldn't matter whether its odd or even, the gear will just be slightly bigger as long as the spacing between each tooth was correct...
 
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