Bringing this back from the dead. I am running 37's now and am having 4.88 gears thrown in. Truck originally was on 31.5's with 4.10 gears.
My wifes friends husband is a ford mechanic and I am trying to see if he will recalibrate the speedo with their computer.
Do I risk anything with the PCM being updates etc and compatability with my 6 pos chip?
Or should I just wait to find some One with an AE?
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