larger tire size adjustment

[casey]

how do i change the tire size with my programmer: i have a 2006 f-250
superduty, it came with factory 31" tires on 17" wheels, and i have put
35" tires on 20" wheels, and this has changed my mph, now i need to
adjust it, but dont know how with the programmer

[mikel]

This tool does not have the ability to calibrate the speedo on Ford super duty trucks. This feature is accomplished through the ABS module, and the Predator cannot communicate with this module.

Thanks