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...
You'd do better to add a supplementary transmission cooler--like a TruCool or one made by B&M. They can be bought for around $150, and they'll lower your temperatures substantially.
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It's a simple 30 minute installation--cutting one rubber hose and plugging a hose into each end with clamps.