Hmm. I assume that it being a 2002 that the speedo is an electronic unit driven off of the rear end.. If so, tire size wont affect speedometer ratio readings. When you put bigger or smaller tires on the truck, the wheel, axle and rear end compnents turn slower or faster accordingly.. If the speedo is triggered off of the ring gear tire size should have no bearing what so ever..
Bradley
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1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5.
Built Ford Tough Moderator
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