Originally Posted by graniteguy
A person loads the stock tune back in their truck, then they notice they lost the MPH and odometer function from the larger tires they have on. These corrections were in the performance tune they had. Can you give a basic step by step on how to go in and change just the MPH and gear size?
Your help is appreciated.
I am pretty sure you have to have a tune, so Fred could make a 87 octane pretty standard tune, you would load that and make the appropriate changes before you upload the tune, otherwise it cant change the stock tune.