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I am having 3.54 gears installed and I am going to need to flash my PCM with the change, however 3.54's are not in the option list of my Hypertech Programmer!! Now what?
You can set it to the closest ratio, then experiment with using different tire diameters & you CAN get it EXACTLY correct..
In my case I installed 3.73 rear, & the closest Hyper has is 3.70 when I had the stock tires on they were 26" diameter but I set the Hyper to 25.5 & my speedo was dead on..
It may take a few tries but just play with the tire size..
You can set it to the closest ratio, then experiment with using different tire diameters & you CAN get it EXACTLY correct..
In my case I installed 3.73 rear, & the closest Hyper has is 3.70 when I had the stock tires on they were 26" diameter but I set the Hyper to 25.5 & my speedo was dead on..
It may take a few tries but just play with the tire size..