I talked to my mechanic a while back about adding a tranny cooler. He looked at my truck and said I already had a heavy duty cooler installed. On one trip with a long up hill pull, I saw the tranny temp get to about 220 degrees. The weather outside was in the mid 60's. I'm wondering if I should add an additional cooler or does this sound about normal!Thanks!

Look for something like this in front of your radiator. It will have some lines coming out of it also. If you don't see 'something' like this, chances are you don't have an auxiliary tranny cooler.My opinion..they are a basic "must" for towing.

In addition to a trans cooler switch to synthetic transmission fluid.

you can add the largest you can fit in, the bigger the better,along with synthetic oil, it shold take over 10 qt. if not thay mixed.

I believe some of the guys with the 7.3s are using the larger coolers from the 6.0 diesels...It's not exactly a direct swap but it helps lower those temps. 220 with an ambient temp in the 60s seems a bit high.

Do you have good airflow through the whole system and where was the engine cooling system temp. The transmission oil can take that temperature for short periods but the life is decreased. If you have a factory cooler which is working ok it should be all you need.

Tranny cooler question | Good Sam Community

ScottG
Nomad
Apr 01, 2014
220 in of itself is not too high and maybe where a thermostat or check valve opens. I would wait for a warmer day before condemning it.
Bob_Olallawa
Explorer
Apr 01, 2014
Do you have good airflow through the whole system and where was the engine cooling system temp. The transmission oil can take that temperature for short periods but the life is decreased. If you have a factory cooler which is working ok it should be all you need.
Iraqvet05
Explorer
Apr 01, 2014
I believe some of the guys with the 7.3s are using the larger coolers from the 6.0 diesels...It's not exactly a direct swap but it helps lower those temps. 220 with an ambient temp in the 60s seems a bit high.
gwilheln
Explorer
Apr 01, 2014
you can add the largest you can fit in, the bigger the better,along with synthetic oil, it shold take over 10 qt. if not thay mixed.
Shadow_Catcher
Explorer
Apr 01, 2014
In addition to a trans cooler switch to synthetic transmission fluid.
downtheroad
Explorer
Apr 01, 2014
Look for something like this in front of your radiator. It will have some lines coming out of it also. If you don't see 'something' like this, chances are you don't have an auxiliary tranny cooler.

My opinion..they are a basic "must" for towing.

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