im sorry. the old thermostat worked fine, but it was a lower temp thermostat. i think it was a 192? the new one is a 203. since the day i installed the old one it moved the gauge but it took forever to warm the truck up. i just thought that was how it was suppose to be. the new one warms up like i would expect any vehicle to. im not saying this is a cure for the shifting problem, but mine hasnt ac