how to change the diff final ratio with programmer

[gatlandc]

I have restored the diff to OEM crown and pinion but I now need to reprogram the PCM to match , I have and XCal3 but it doesn't have a option to change to 3.55 ratio. Does anyone know when I can get s stock XCal3 file or if this can be modified with Forscan?

[FordNut]

Unfortunately gear ratio isn't user accessible on xcal3. Somebody with full tuner access will need to build a file for you. First person I would try is Marty. Mo's Speed Shop.