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Old 07-06-2014, 09:35 PM   #21
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193 is fine. Concern starts, for me at least, around 225 and I don't want to see above 250.

At that point pull over, toss it in park and let it idle. The fluid keeps moving, the fan keeps spinning and it will cool things off far quicker than just turning it off.
Neutral, not park, keeps the oil moving through the transmission and cooler. Park just dumps the oil back into the pan.
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Old 07-06-2014, 09:53 PM   #22
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193 wouldn't worry me on a newer transmission since it seems as if the newer ones run a little hotter. Modern transmission fluid, especially synthetics, are much more heat tolerant than trans fluids from even ten years ago. On my '01 Superduty my trans temps never go above 170-180 when pulling my 5er up and down mountains and it seems to hang around 145 most of the summer when driving without a trailer.

270 degrees like you mentioned in your initial post sounds ridiculously high. Unless I saw some data about temps that high being OK I am calling B.S.
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Old 07-06-2014, 10:15 PM   #23
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Joshuajim , we are still in th early 2000's 2014 is not even 1/4 of he way through. So i'm not sure were you get 20-30 years ago. Since you are not believing an expert can you please tell use how many years you have been designing and testing transmissions.
Do you or lbr KNOW when these "tests" were done? I suspect not.
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Old 07-06-2014, 11:20 PM   #24
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Neutral, not park, keeps the oil moving through the transmission and cooler. Park just dumps the oil back into the pan.
Nope, wrong. I can't tell you how many trans flushes I've done over the years with the cooler lines open for the machine, engine running, trans in park and fluid flowing like a river.
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Old 07-07-2014, 07:01 AM   #25
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joshuajim, sines the engineer did not retire till 2007 I am guessing he tested up to that point, so up to 7 years ago he was testing transmissions.
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Old 07-07-2014, 11:30 AM   #26
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joshuajim, sines the engineer did not retire till 2007 I am guessing he tested up to that point, so up to 7 years ago he was testing transmissions.
Testing transmissions in well below zero degrees is NOT what a senior engineer does near the end of his career. Most likely the tests were done by him early in his career 20 or 30+ years ago.

Again, do you know when the tests were done?
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Old 07-07-2014, 12:26 PM   #27
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I don't understand your logic. Where I work I do the testing but the senior engineer goes over the data to make sure it matches simulations and is within the test specifications.
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Old 07-07-2014, 12:56 PM   #28
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Why don't you contact Mark and ask him yourself? He is on many different truck forums, including ford-trucks, thedieselstop, powerstrokenation and others. He word is highly respected.

Or you could just drop it and move on.


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Old 07-07-2014, 01:48 PM   #29
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Why don't you contact Mark and ask him yourself? He is on many different truck forums, including ford-trucks, thedieselstop, powerstrokenation and others. He word is highly respected.
Why do you regurgitate information that you have no direct knowledge of and that may be irrelevant to today?
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Old 07-07-2014, 03:49 PM   #30
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Why does it bother you so much that someone else may know more than you?




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