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Old 10-15-2018, 02:12 PM   #5
DieselSJ
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Join Date: Jun 2016
Location: Phoenix, AZ
Posts: 574
Re: Trans cooler, too big?

Route it this way - Trans > external cooler > factory cooler (radiator) > trans

Contrary to popular belief, you CAN overcool a trans. You want it running right around 180 degrees.

Routing this way does a few things -
First, keeps the hottest fluid out of the radiator. Why would you want to put the hottest fluid into the cold side of the radiator? So this takes some of the load off of your engine cooling system.

Second, when it is cold it can put some heat back into the fluid so you don't overcool it.
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