[greasyF250]

Originally Posted by jbiersba

I know i've read on this site before what the max tire size the ford factory computer is capable of being adjusted to, but I can't seem to find it.

Recently switched from he stock 33.3 inch tires to a set of 35's. It has affected my spedo a bit.

Truck is going in for service next tuesday, wondering if I should bother to ask the service guys to try and adjust the computer?

Thanks

try this link Speedometer Calibration??? - Ford Truck Enthusiasts Forums It worked for my 95 f150