average trans temp?
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Joined: Aug 2007
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average trans temp?
was just wonderin whats average automatice trans temp... 99 f350 7.3 of course... am just curios as to what ya'll run cause i am lookin at gauges now and was wonderin how hot it should go up to cause the one im lookin at goes up to 250... hope it dont get much hatter than that... Donny D
Post Fiend
Joined: Sep 2006
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From: Sioux Falls, SD
That should be just fine. Normally tranny temps run @ 70 degrees over outside air temps. Towing will run hotter. If you hit 220 you want to pull over and let her cool down. After the tranny mods I haven't seen mine go over 190 while towing my 10,000 lb 5th wheel.
Regular tranny fluid starts to break down around the 225 range, if you tow alot synthetics is the way to go. Cost more but can handle the higher temps much better.
Regular tranny fluid starts to break down around the 225 range, if you tow alot synthetics is the way to go. Cost more but can handle the higher temps much better.
Last edited by white Buffalo; Aug 27, 2007 at 12:06 AM.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
200 is NOT an issue. If you get to 220F you want to find a safe place to stop and let the truck fast idle in park or nuetral. These transmissions are designed to go to 250F for a short time with NO damage.
Not a liberal...
Joined: Jul 2006
Posts: 6,635
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From: Cut & Shoot, Texas
The transmission might be able to withstand the 200 or 250* temps but the fluid can't. It begins to sheer and lose it's lubricating qualities and then trans wear starts. Check this out:
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
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From: SE Florida
The fluid can take the temps, too. That chart is for 1960's type fluids. It is useless for modern fluids.
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Not a liberal...
Joined: Jul 2006
Posts: 6,635
Likes: 4
From: Cut & Shoot, Texas
Originally Posted by Mark Kovalsky
The fluid can take the temps, too. That chart is for 1960's type fluids. It is useless for modern fluids.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
DieselSite is trying to sell coolers and synthetic fluids. That chart is a good tool to do both. That doesn't make the chart right.
I've gone around and around with Bob. He doesn't believe me, either. He has a vested interest in having people believe that chart. I know it's wrong.
I've gone around and around with Bob. He doesn't believe me, either. He has a vested interest in having people believe that chart. I know it's wrong.
Not a liberal...
Joined: Jul 2006
Posts: 6,635
Likes: 4
From: Cut & Shoot, Texas
Yeah I have no doubt that it could be a marketing tool. I will take your word for it. I never see over 150 to 160* and that's in Houston heat so I know I am good. Appreciate your input.
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Just speaking for myself, I will not drive around with tranny temps above 200. Fortunately it is not an issue for me. If it becomes one, there will be some aux cooling.
Just because it may or may not be able to take it is not good enough reason for me when keeping it below 200 is not that hard. Especially since mine also goes through the radiator too. I don't want that heat soaking into the coolant either.
I would think the cooler, the better for longevity. And my tranny gauge redlines at 260*. just my 0.02. Of course I'm lucky I don't tow much heavier than the boat.
Just because it may or may not be able to take it is not good enough reason for me when keeping it below 200 is not that hard. Especially since mine also goes through the radiator too. I don't want that heat soaking into the coolant either.
I would think the cooler, the better for longevity. And my tranny gauge redlines at 260*. just my 0.02. Of course I'm lucky I don't tow much heavier than the boat.