Originally Posted by Robertc82
Well I got my XRT Pro hooked up today. I updated the software and went to install it on my truck and NO TIRE CALIBRATION option!!! That is the main reason I bought it. Maybe I'm doing something wrong. I don't know. Anyone know anything about it?
The tire size calibration in the 6.7L is not in the download menu like the previous 6.4L models. Go to the Menu in your tuner, then find Tire Size Calibration. You can set/re-set the tire size at any time without performing a download, which makes it very fast and easy to dial in the correct size. Let us know if you have any questions about it.