Tranny Temps? - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 03-06-2009, 10:00 AM Thread Starter
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Tranny Temps?

What is the limit to go on a tranny gauge before running to hot?
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post #2 of 8 Old 03-06-2009, 12:14 PM
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An E4OD or 4R100 needs to be a min of 125deg to work right and for the converter to lock/unlock properly. It is considered HOT around 190. If it regularly gets above 200 you need to look for a problem, but the occasional spike to 200 -210 isn't too bad. It'll run hotter if the converter is not locked or in traffic. Of course it'll run the coolest on the highway.

A good tranny cooler should knock about 20 degrees off your hottest reading,..... give or take. In general, the cooler the better, just as long as you get the 125.
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post #3 of 8 Old 03-06-2009, 12:21 PM
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A good trans cooler will keep the temps 60-65* above highest ambient temps under heavy load.

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post #4 of 8 Old 03-06-2009, 12:22 PM
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Good to know!

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post #5 of 8 Old 03-06-2009, 12:25 PM
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try and keep it under 200... when i installed my 6.0L trans cooler it dropped it 60 degrees
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post #6 of 8 Old 03-06-2009, 12:27 PM
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Any temp is good. See pic below

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post #7 of 8 Old 03-06-2009, 12:34 PM
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This might be helpful:
Transmission Heat Chart

I, too, put in a 6.0L tranny cooler - Much better!!!!


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post #8 of 8 Old 03-06-2009, 12:49 PM
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I run dual tranny coolers and have never seen anything above 150

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