2010 sport,just installed 37 inch tires,how do i recalibrate the speedo,thanks

 

If they have not changed it there is a wheel speed sensor that reports how fast the wheels are rotating. The ECU uses a multiplier to convert that measurement to vehicle speed. To recalibrate you need to change the multiplier in the ECU. If you have a programmer you can reset it. If not a dealer can do it for like 40 dollars...