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Im running a 65 mustang with a t5 and 3.89 gears. the tires are about 26" tall. what speedo gear should i get. im running the stock one right now and it reads too high.
 

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if you go to hanlon motorsports web site
they have a calulator-you enter your info
and it tells you the speedogear you need
 

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if you can drive on a hwy. that has mile markers such as an interstate and see how many more miles your speedo registers compared to the actual mileage based on the mile markers you can figure what size gear to change to.if i'm not thinking backwards you probably will be needing a gear with more teeth
 
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