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Old 03-15-2020, 09:35 AM   #5
JM 35 Sedan
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Join Date: May 2010
Location: Near Rising Sun, Maryland
Posts: 10,137
Default Re: speedometer gearing

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I have 3.54 gears in my '35 fordor and I'm using a turtle with #18, and it definitely has and 18 tooth gear. Tires are 600x16's. The speedo and odometer are deadnuts on per my two gps's.
If you definitely have an 18 tooth turtle, then I'm thinking your speedo head is causing your problem, or maybe too much friction in your cable.
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