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mph=tire diameterX.003XRPM/gear ratio

Dont forget to multiply the ratio of the gear in the tranny. Only drive (3rd gear) would = 3.73.
 

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If the car is the 89 in your name, you have a 7 tooth drive gear which needs a 19 tooth (red) driven gear for 3.73's.
 

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Whatever color the gear ends up being you need a 21 tooth with the 3.73's. Even still your speedo will be off a few mph cause your using a taller tire.

It seems funny that with all the Mustang knowledge and advice I've seen you give to people about engine combos, torque converters, gears, and valve bodies you wouldn't know this one Donny. Maybe MM&FF will have a article next month for you to read or is it 5.0?:rolleyes:
 

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Gnocid5,Amen Brother !!!!!!

Red89Notch ,Your the biggest Tool ever.....
I guess I better look out this spring a Donny.

Chris
 
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