ProCal SNAP for the 2019+ HD Ram 2500/3500 truck is a simple, cost effective calibration module that will accurately correct your speedometer after installing larger tires (up to 42€³ tall) and/or changing the axle/transfer case gear ratio, saving you from the headaches of going to the dealership or purchasing unnecessary equipment. The ProCal SNAP even has the ability to adjust your TPMS threshold, a very important feature to have when running larger tires with less air pressure.