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After you find which one that you need, you change the gear on the end of the speedo cable. There are several programs to make the calculations.
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John
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In the cool still quiet of night, you can hear chevies rusting away.
If you can find a good Ford parts dept., they can look-up the gear ratios offered for your truck, & find the p/n for the closest match to what you have. The gear plugs into the trans (speedo connection) & is color-coded, dependant upon the diff gears.