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Looking around the forums, I can't find anything on folks reprogramming different tire size in the PCM so that the speedometer & odometer read correctly. Are folks not fixing this when changing tire sizes, or are they just not talking about it? I simply want to confirm what methods are...

My wife says her truck's lately been randomly displaying AC OFF on the gauges, which would be expected if it's getting close to overheating... but when asking her about the temperature, she says the temperature stays normal and never displays an ENG HOT message (which the owner's book says...