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Just wait till you hear about how to re-calibrate the driving modes for 37s.... <<<<
I've been rolling 37's for years, and your just now telling me this shit.
Gen1 doesn't need it. Gen2 has phase-matched coaxial cabling running to each wheel to send telemetry data back to the BCM. 35s show as a 250ohm load to the BCM, however in order for driving modes to work correctly with 37's you have to reprogram the BCM to look for a 750ohm load.
This can be done by shorting pins 7 and 42 to pins 13 and 26. Once you've done that you need to go back into the truck, depress the brake pedal for 30 seconds, lock the doors, buckle and unbuckle the center rear passenger's seatbelt 4 times then turn the key on.
You'll see a special screen with a warning saying "Engineering use only...something something warranty void...something something" but you don't care, because only losers would want to run 35s. **** warranties. So you scroll down using the paddle shifters and select menu option 7 "Racing Functions" by smashing the gas pedal.
From there go down to option 3 "Calibration for 37x12.50r17 BFG Projects" Ford knows this is the only tire you should run if you want to win. **** other tires. Select the calibration process and follow the on screen instructions. It will have you back up in 2 clockwise and two counterclockwise circles, then drive forward and do two similar circles. If you did it correctly the motor will emit a mighty V6 roar to let you know you're ready to be a ******* winner.
I told you it's some tough shit to get through.
Edit: Paragraphs...