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By darrell - 2 Years Ago
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i have a 390 rear.how many teeth do i need on the speed o gear.its in a 55 but im using a 58 trans so had to go to a newer cable.thanks
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By paul2748 - 2 Years Ago
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There is a formula that takes account of the gear ratio and tire size, but I don't have it.
Have you tried it with he current gear? how much are you off ? If so, count the teeth on the current gear. More teeth slows the speedo, less teeth make the speedo faster. Each tooth represents about 4-6 mph.. New gears are available - try ebay - lots of them on there.
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By FORD DEARBORN - 2 Years Ago
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By FORD DEARBORN - 2 Years Ago
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This is thre best I can do, maybe someone could size it a little better. It's the formuila from an NPD truck catalog. NPD also has many Ford speedometer gears. Hope this helps.......
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By darrell - 2 Years Ago
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im fast so i need more teeth.i found that out yesterday.ill start from there.thanks
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By paul2748 - 2 Years Ago
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Maybe this is clearer - and right side up
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By FORD DEARBORN - 2 Years Ago
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Thanks Paul and BTW, I have used that formula twice - very handy.
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