i have a 2000 ram 2500 with an automatic trans lately it will light up the trans temp light. I pull over and stop within 10 to 20 seconds after this occures and check the pan temp with my laser temp gauge and every time it registers 170 degrees, also checking the lines to the cooler in front of the radiator registers within 10 degrees of the trans. The truck only has 56000 miles on it, and the fluid looks perfect and full. Any help with this would be appreciated.