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Old 10-16-2018, 01:31 PM   #11
DieselSJ
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Join Date: Jun 2016
Location: Phoenix, AZ
Posts: 574
Re: Trans cooler, too big?

Quote:
Originally Posted by Tom View Post
Not sure what your specs equal size wise, but a long time ago I bought the biggest b&w tans cooler I could find, think it was like 22,000GVW rated or so. Had a 200-4R with a 2400 stall convertor in it. Ran fluid from trans to radiator to cooler back to trans. In stop and go traffic for 30min on a 115* day here in phoenix I finally got it up to a whooping 145* trans temp. That was the highest it ever got, way too cool for optimal trans operation and fluid life. So yes, you can go too big.
That is why you run it through the external cooler first, then the radiator.
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