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I'm in need of some help here the orig tire size for my truck is 235 75 16 I know have 285 75 16 which I know are 33's. I know my odometer and speedometer would be off going to the bigger tire size, however I hooked up by power programmer and programmed the computer for the bigger tire size. Now does that only correct my speedometer or did that correct my odometer to read right too. If not how do I figure out how far I've actually gone. Thanks
 

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It will correct both . they work together. check speed with a G.P.S . I corrected mine with a snap-on scanner , it didn't have an option for my tire size so I used the rpm(revoluton per mile) option. 63360 divided by the circumference (3.14 x diameter) of the tire.
 
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