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for those that dont know how to change tire size...
after the pcm logs on you will get the
vehicle selection box...when it open go to the bottom where it said system...it should already say enhanced power train..click the drop down arrow and change it to anti lock brake then click on ok...after the truck connects..click on the test on board system tab...click the drop down tab next to the initiate button and select tire size......when open there will be a left and right arrow on the far right next to the initiate button..click the right arrow to get a bigger tire....now mine goes to 40.0 inches...didn't try to program it for that so I'm not sure if we can adjust that big or not..i am looking into this as we speak...
just got a e-mail from AE..i will just share it here.i asked since the program goes to 40.0..can we program for that...this was there reply...
No, the ECM will only accept to 35ins. There is no provision for any larger.
You need to run around the ECM with a piggyback board for larger.
I just got the '03 - 04' 6.0L done today and it also has that limitation.
The '05 and later will be resolved today as well but I bet it also is locked
to 35in and under.
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