130*-140* tranny in 45*-55* temps - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 6 (permalink) Old 01-24-2010, 03:24 PM Thread Starter
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130*-140* tranny in 45*-55* temps

First trip I took since the gauge install, and the trans warmed up and stayed around 130*-140*, it was roughly 80-85 degrees above the outside temp, this is not towing or hauling anything, just running 75mph. From what I have read 70* above ambient is optimal, so I figure it would be worse towing, guess I need to invest in a better cooler

2002 F250 CC 4x4
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post #2 of 6 (permalink) Old 01-24-2010, 03:37 PM
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Re: 130*-140* tranny in 45*-55* temps

You are doing way better then I am. I usually see 100 over.
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post #3 of 6 (permalink) Old 01-24-2010, 07:11 PM
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Re: 130*-140* tranny in 45*-55* temps

100 over ambient is normal and nothing to be worried about.
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post #4 of 6 (permalink) Old 01-24-2010, 07:40 PM
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Re: 130*-140* tranny in 45*-55* temps

, thats about where im at and no problems.

02 F-250 4X4

96 F-250 4X4
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post #5 of 6 (permalink) Old 01-24-2010, 07:52 PM
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Re: 130*-140* tranny in 45*-55* temps

if you're still running your stock cooler, your trans temps should be around your normal engine operating temps, since the stock trans cooler runs through the radiator.

i was always told you shouldn't have drastic temperature differences; everything in the system should be around the same temp, give or take 20 or 30 degrees.

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post #6 of 6 (permalink) Old 01-25-2010, 12:58 AM
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Re: 130*-140* tranny in 45*-55* temps

Quote:
Originally Posted by Hawker View Post
if you're still running your stock cooler, your trans temps should be around your normal engine operating temps, since the stock trans cooler runs through the radiator.
No, that's not how that works.

The ATF does go through a cooler in the radiator, but the cooler is on the cool side of the radiator. The coolant around the cooler has already been cooled by the radiator and is A LOT colder than engine operating temperature. Isn't that what the radiator is there for?

The cooler in the radiator will NEVER warm the ATF. I've measured this in ambient temperatures from +115F to -40F and never found a condition where it's even close. The coolant in the cold side of the radiator is ALWAYS colder than the ATF.
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