I posted to the SuperDuty thread about correcting the speedo for larger tires:
https://www.ford-trucks.com/forums/6...ger-tires.html
but I can't seem to find a Ford dealer in San Diego that knows how to recalibrate the PCM for larger than OEM tire sizes. I tried Kearny Mesa Ford and Drew Ford, both in San Diego. First they said "no problem" then after several hours of trying they said "can't be done." Can anyone recommend a dealer in or near San Diego that can perform such a service? Thanks!