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Speedometer correction after tire size/axle changes

indymanjoe
in Pontiac Suspension, Brakes, Rims & Tires Dicussion/Questions

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Found this chart online and i found it very useful and so far accurate.

i went from a 2:78 rear axle to a 3:50. changed tires from f-70 14inch to 275/60-15 in back.

speedometer was always too fast figured i would play around and see what i could do.

this chart helped me get the correct speedo gear and the trans driven gear for the dirty girl.


https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwigt6GW_rOAAxVRkIkEHSIsAxEQFnoECAoQAQ&url=https%3A%2F%2Fwww.chevelles.com%2Fthreads%2Fset-that-speedo.1132214%2F&usg=AOvVaw1egmIdDOUAw_vybTQRf4JQ&opi=89978449

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