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Hello,
I am still trying to understand the ins and outs of tuning these trucks, so bear with me.
I purchased my truck about a year ago. The guy I purchased the truck from added a mileage tune to the truck calibrated for 35" tires. Since then, I have pulled the lift off and am rolling around with 33" tires. The speedometer is far enough off that I would like to recalibrate for 33" tires. I seem to remember the guy saying the tune is unlocked. I do not own an auto cal or any other equipment. What would be the easiest way to keep this tune and recalibrate tire size without flashing back to stock and continuing from there.
 
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