Calibrating speedometer

[75Highboy]

2025 Flash: Just installed a 3 inch lift kit and 295/70/18 tires and wheels. These tires are 34.5 inch tall comes to stock at 34”.
Is there a way to change the tires sizes in the program to get the correct speed?

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[bmwhitetx]

See my FORScan post.
https://www.f150lightningforum.com/forum/threads/f150-lightning-forscan-thread-version-2.23634/

 

[Bwanapete]

I had assumed the speedometer was working off data from the GPS just like the nav system. Seems from this thread that it works off the transmission except there isn’t one.

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