Tranny temps - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 02-06-2013, 07:27 PM Thread Starter
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Tranny temps

Driving home one night last week, my tranny temp on my Scan Gauge stayed around 171*. Outside temp was 41*. My speed was 55, unloaded. Truck has 77,000 miles is completely stock and the transmission was flushed at 54,000 miles. I've only had this truck for a month. Is this temp normal for the circumstances stated? I plan to tow my 8,000# 5th wheel starting in May. Am I going to have to upgrade/replace my stock cooler or something more $drastic$?

2010, Lariat Stroke, Sterling Gray Metallic, CC, FX4, SB, 20" factory rims, Wrangler ATS, XDP coolant filter, Truxedo LO-Pro QT tonneau cover, ScanGauge II, DPF-R+4.0, CAT/DPF delete, Flo-Pro delete pipes, stock tips. Stromberg-Carlson power step for the wife.
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post #2 of 6 Old 02-07-2013, 04:41 AM
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Originally Posted by wargle View Post
Driving home one night last week, my tranny temp on my Scan Gauge stayed around 171*. Outside temp was 41*. My speed was 55, unloaded. Truck has 77,000 miles is completely stock and the transmission was flushed at 54,000 miles. I've only had this truck for a month. Is this temp normal for the circumstances stated? I plan to tow my 8,000# 5th wheel starting in May. Am I going to have to upgrade/replace my stock cooler or something more $drastic$?
I would not be worried one bit! Tranny Temp

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post #3 of 6 Old 02-07-2013, 05:11 AM
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our transmissions have a thermostatically controlled bypass valve that only allows 10% of the fluid to circulate through the cooler when the transmission is below 165*, and sends the 90% back through the trans un-cooled... this is why your transmission likes to stay around the 170* mark when not being worked hard.. it will reach 165* quickly, and then that valve goes into action, fluttering open and closing, sipping cooler fluid as needed to keep you around the 170* mark..

you're right on the mark, my man..

it's when you're working the crap out of it and have reached the circulation-to-heat exchange @ 100% rate, and still climbing in temperature when you have a problem.. and that is a bad problem to have!!

here is a good chart that shows what happens to transmission fluid, soft parts and hard parts at various intervals.. you'll see that the 170* is prime.. anything below 140* is also hard on a transmission, but generally only that it won't flow enough.. it will buck and such under such circumstances, but even then- modern transmissions w/ electronics controlling them generally won't allow o/d or t/c lock-up unless you've reached a certain temperature range..




Last edited by drewactual; 02-07-2013 at 05:19 AM.
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post #4 of 6 Old 02-07-2013, 09:01 AM Thread Starter
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Outstanding! Thanks for all your help. I'm learning as I go and it's info like this from you histhat makes this forum the best.

2010, Lariat Stroke, Sterling Gray Metallic, CC, FX4, SB, 20" factory rims, Wrangler ATS, XDP coolant filter, Truxedo LO-Pro QT tonneau cover, ScanGauge II, DPF-R+4.0, CAT/DPF delete, Flo-Pro delete pipes, stock tips. Stromberg-Carlson power step for the wife.
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post #5 of 6 Old 02-07-2013, 10:40 AM
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Tranny temps

Drewactual u seem to know a lot about transmissions. U a mechanic or mechanical engineer?

If u are or aren't, I'm sold and impressed! Thanks for the spread of wisdom.


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post #6 of 6 Old 02-07-2013, 10:46 AM
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Drewactual u seem to know a lot about transmissions. U a mechanic or mechanical engineer?

If u are or aren't, I'm sold and impressed! Thanks for the spread of wisdom.


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