I have a 2011 FX2 EB with 3.15 gearing. I'm new to the site and need some help. What all is involved in changing to a 3.55 gear ratio? Other than the mechanical work, what all needs to be recalibrated on the truck? I have a cold air intake, exhaust and a tuner. My best run to date is a 15.07 @ 98. That was with only the tune on the truck. I feel that mile per hour should translate to a much lower et. I can change the gearing on the tuner, but is there anything else that needs to be done as far as the computer on the truck or trans?