I have a 2016 F150 5.4 that the customer went to 31.9" tires. I am completely lost on how to correct the speedometer. I have tried changing the Gear Ratio and Tire Size with no luck. Here are a few of my questions. What is Learn From BCM vrs Calibration on the gear ratio and final drive? Next what is the Driven Tire Circ, Max Tire Circ, and Min Tire Circ? Same thing on Final drive what is Max Ratio and Min ratio? I have changed these setting all over the place and it doesn't seem to change the speedometer at all. What am I doing wrong?