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changing tires size & how to correct?????

1756 Views 12 Replies 6 Participants Last post by  WhonosWho
i am lifting my truck 8" and putting 38" tires on it. How can i correct the speedo. Ithink it will be off alot. and don't want a ticket for speeding. Any sugestions???????

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Innovative and ATS can build you a custom tune that will calibrate speedometer and shift points. I went with Innovative, but I have heard good things about both.
If you don't want to use a tuner, Ford can calibrate for up to 35" tires. This will atleast get you close.
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