MMcc
OBS Enthusiast
I just sent it in to Black Bear Performance for a "traditional tune" and update with my tire size and gear ratio.Should be fine, shift schedule might seem off, but the truck will just think it's going the speed your speedometer says.
Shift schedule is based on throttle position and Mph, so it should shift the same rpm as it has been. Once you calibrate it, it might be different.
What means of calibration do you have?
The ABS light has been on since the speedo and wheel speed sensors have been so far off. Speedo was about 15 mph high at 75 mph after changing from 3.73 to 4.56.