Transmission Operating Temp
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Junior User
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Transmission Operating Temp
Driving at 65mph, air temp in the 90's, towing about 11,000 lbs with my 6.7 F350 I am seeing what seem to me to be high transmission temperatures. Mostly 210 to 216. As much as 221 climbing grade. Flatland with no trailer I usually run about 200 on highway. Seems high to me but dealer says that is normal. Hope he is right. Looking for feedback from you guys.
Senior User
Joined: Jan 2016
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From: El Cajon, Ca
I have the 6.2, but I don't think that matters with regard to tranny temps. My trailer only weights 7,000lbs. Two weeks ago I was pulling through the Arizona desert when it was 115deg outside, the tranny ran study at 206. The only grade I saw was 6% coming out of Phoenix headed to Flagstaff, that is a tough long pull. Same outside temp and my tranny peaked at 223, but only for a very short time, maybe 5 minutes before it cooled back down. It ran for awhile at 210-215.
Hope this helps.
Hope this helps.
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Joined: Oct 2018
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Under the conditions you describe, I'm seeing the same temp ranges. Drove California 58 from Bakersfield to Tehachapi (about 30 miles) a couple of days ago, temp in the 80's in Bakersfield and high 60's in Tehachapi. Transmission temp got to 227 and I hit the panic button, slowing down to 15 mph to keep temp down. Engine oil temp was 230 at max. The transmission analog gauge hardly budged, but I've never seen a transmission temp that high on my two previous super duty trucks, a 450 and a 350. I'd sure like to know what is a seriously high number, though. I've seen 217 a couple of times.
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Tuned
Joined: Dec 2017
Posts: 387
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Up to 248F normal. Ford certifies Mercon LV oils for oxidation resistance using a pass/fail test called Aluminium Beaker Oxidation Test (ABOT) at 311F for a duration of 300 hours. So I would immediately change my tranny fluid if I ever got close to 311F or above for any length of time.
Additionally, my 6R140 oil looked fantastic on my '11 6.2 after extensive amounts of towing at high elevation and high rpm horsepower outputs when I changed the oil and filter at 150,xxx miles. The tranny temperature gauge occasionally hit the warning limit on long uphill pulls throughout that truck's life before I traded it in on a new 18 last spring. And you can bet I went with a F-350 and the 6R140😀
Additionally, my 6R140 oil looked fantastic on my '11 6.2 after extensive amounts of towing at high elevation and high rpm horsepower outputs when I changed the oil and filter at 150,xxx miles. The tranny temperature gauge occasionally hit the warning limit on long uphill pulls throughout that truck's life before I traded it in on a new 18 last spring. And you can bet I went with a F-350 and the 6R140😀
Last edited by MBuckholz; Oct 16, 2018 at 07:33 PM. Reason: Spell
Tuned
Joined: Oct 2019
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From: Lowcountry
@gary 5th wheel the LV in Mercon LV means low viscosity. At the temps you mention, the fluid is in its sweet spot and the low viscosity allows it to shed heat fast. Pulling the Ike last summer I saw as high as 240 but the fan kicked in and kept the temp from rising and going down hill the temps went back to normal with no issue. I was concerned at the temps when I first purchased the truck especially when my co-workers mentioned their Rams stay at 170 unloaded.
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Driving at 65mph, air temp in the 90's, towing about 11,000 lbs with my 6.7 F350 I am seeing what seem to me to be high transmission temperatures. Mostly 210 to 216. As much as 221 climbing grade. Flatland with no trailer I usually run about 200 on highway. Seems high to me but dealer says that is normal. Hope he is right. Looking for feedback from you guys.
change your thermostat at the transmission cooler. Part #RT1256 or hc3z-8575-c. I was having same heat issues. Truck was getting hot because oil was hot. The thermostat was stuck and wasn’t allowing the trans cooler or oil cooler to work. I now stay at 200 or less with a 15k load on the truck.
