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Old 07-10-2015, 09:27 AM   #1
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When is it too hot

Was watching the temperature on the transmission while going to the resort and it was goin over 200 degrees, what is considered to be too high of a temperature on the transmission ?
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Old 07-10-2015, 09:33 AM   #2
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Old 07-10-2015, 09:35 AM   #3
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Here's a chart that might be helpful.

TRANSMISSION FAILURE/TEMPERATURE CHART

Also found this:

“General Motors’ in-house towing team expert provided RV Clinic with this statement: The maximum allowable automatic transmission fluid temperature is dictated by the transmission oil itself. The oil begins to degrade significantly above 270 degrees Fahrenheit, so we design vehicles so that in all but the most extreme conditions, the fluid temperature in the transmission sump stays below 270 degrees F.

We allow for up to 285 degrees F in extreme conditions (i.e. towing a trailer with combination loaded at GCWR in Death Valley). But for customer usage anywhere else in the country, even at GCWR, transmission sump temperature should stay well below 270 degrees F. Above this point, certain internal components, such as seals, begin to disintegrate rather quickly. Although newer synthetic fluids can withstand higher temperatures we still recommend this (270F) as a maximum temperature. "
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Old 07-10-2015, 09:39 AM   #4
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Just remember this chart is from a company trying to sell you a "transmission protection kit". i would like to see the testing they did to come up with those numbers.
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Old 07-10-2015, 10:56 AM   #5
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My 2 cents

When I had my transmission 'updated' , basically a complete rebuild,
I did it because the 400r transmission has been known a weak link,
I made sure that I had a heavy duty torque converter installed as well.

Along with that I installed a 'True-Cool' transmission oil cooler in series to the stock one.

Prior the additional cooler I would see temps hit 225F , which is ok for short durations but not for long hauls.
Now with the added cooler and an even larger 5th wheel I have never seen 200F and runs at least 40+F cooler than ever before.
My transmission Guru told me a 'cool transmission is a happy transmission'.
I also run a semi-synthetic transmission oil as well.
So IMO a larger or additional tranny oil cooler is good insurance.

Hope this helps
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Old 07-10-2015, 12:56 PM   #6
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Islander, did you mean a 4R100 transmission? That's what your 2000 F350 should have.

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Old 07-10-2015, 01:03 PM   #7
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Quote:
Originally Posted by Happy Vibe View Post
Just remember this chart is from a company trying to sell you a "transmission protection kit". i would like to see the testing they did to come up with those numbers.
I doubt they did any testing. That chart is all over the net in different formats.
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Old 07-10-2015, 01:08 PM   #8
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My TV has the factory tow package and all HD cooling available. I typically run 85 degrees Celsius (185 degrees Fahrenheit).

On a trip last summer ambient temperature was 30 degrees Celsius (86 degrees Fahrenheit) with some hills in my travels and the highest transmission temperature I encountered was 95 degrees Celsius (203 Fahrenheit)
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Old 07-10-2015, 01:49 PM   #9
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The over heat number from strat56 are the same numbers pre set in my truck from ford Motor. It is also the same numbers found in my owners manual. You should get a warning light when you get 10 to 15 degrees from the pre set limit on a newer truck. But I would invest in a cooling package if you are in the 220's any extended period of time
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Old 07-10-2015, 02:36 PM   #10
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In our old RV, a V10 gasser, with around 5,000 lb toad, I would see transmission temps that always stayed within a few degrees of 200F. Climbing the pass at Chattanooga, they would go up by around 10-15F temporarily. I just watched for anything outside those parameters as they were normal. On my Jeep, not towing anything, they stay around 205F. Seems to be a pattern there.
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