I have installed an additional trans cooler with fan on my 2006 Dodge diesel 5.9. My cooling temperature on the Hwy is 165, however in town traffic it shoots up to 200 to 212. I thought about installi...
212 is not all that high. By shifting into neutral when stopped in traffic you can lower the temp because of the torque converter slipping while stopped. I'd try that before spending any money.