AEV's ProCal Module for 2013-17 Ram 1500/2500/3500 trucks is a user-friendly recalibration tool that has a variety of unique features. One of the most popular features of the ProCal Module is its ability to correct the speedometer when larger tires (up to 48'tall) are installed. When the speedometer is left uncorrected, there is a major degradation in the performance of the stability control (ESP), transmission shifting, and engine performance €“ the ProCal Module will eliminate these issues by ensuring that the vehicle is properly calibrated.