Thats where mine runs, with probably the same size cooler. Im getting ready to put a thermostat on it to get it warmer, because i cant imagine how that can be good for it. IMO the fluid needs to be warm enough to evaporate off any moisture that might form in the trans, and i cant see 100º oil doing that.
My setup: Trans-> radiator-> aux filter-> aux cooler-> trans. Temperature reading comes from the test port on the side of the trans. I used to get it from my aux filter housing, and that reading was typically 20º cooler.
Dont forget, the trans fluid runs through the cold side of the radiator not the hot side, so its not seeing 200º coolant. it actually does cool the trans fluid more than you would think.
My trip to work is 1 mile in town, 16 on the freeway, 1 mile in town (18 total each way). Just last night it was 50º, and i never got the trans over 112º. It has always run cool (for years now), but i put a bigger cooler in when i tuned it up (this past spring) to keep the temps down while towing. But now that its cooler out its running borderline too cold.
Im not sure of that. However if the trans was ever replaced, 99% of trans shops will bypass the radiator and put in a small cooler up front, just in case there is debris in the radiator. Dont want to damage that new transmission!
I like having it in there, i figure its got to help heat the trans up a bit in the winter, if even only to ~100º or so.
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