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...
For starters, 212 is a safe trans temperature. There is no reason to bat an eye at anything under 230. 165 is a little on the cold side in my opinion, but not damaging. Adding a larger pan will keep a trans from heating up as fast (so it will not get as hot on a climb, but it is not the remedy for a loose TC that is generating heat all of the time).