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Old 08-29-2015, 05:15 PM   #1
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Transmission temperatures

What would be a normal transmission temperature while pulling a trailer?
And where do you top out when climbing long hills?

Just wondered since my truck displays tranny temps if I want.

Chevy Silverado 1500 loaded, pulling a Nash 19b.
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Old 08-29-2015, 05:42 PM   #2
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My super duty 08 Ford with a 6.4 diesel running hard thru the passes in southern Colorado ran 170 to 175. I have a scanguage II.
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Old 08-29-2015, 09:18 PM   #3
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The truck in signature stays at 167F with a ~18,000 trailer behind it. That's going up hills, 60 mph, 75 mph, everything so far was 167. I actually thought the transducer was broken at first until I pulled over and it climbed up to 171-173.


2015 Ram 3500 Laramie Longhorn CC LB Dually. Cummins, Aisin, 4X4, 4.10. Max towing-28,750. Max payload-5,436.
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Old 08-30-2015, 06:55 AM   #4
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It depends on the truck, as well as the year. Newer transmissions run higher temps as they are thermostatically controlled, and designed for it. Our 2011 F150 Ecoboost w/3.73 axle run a pretty consistent 195*F-205*F temp, (loaded or unloaded), at 100*F or so.

As you notice, there is more info there than just the temp. Ambient temp plays a role as well as your RPMs you run, of course if the torque converter is locked or not, and other factors.

My 2000 F350 with diesel empty usually runs 50*F-70*F above ambient temp on highway. Loaded is somewhere around 80*F-100*F above ambient.
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Old 08-30-2015, 12:18 PM   #5
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The truck in signature stays at 167F with a ~18,000 trailer behind it. That's going up hills, 60 mph, 75 mph, everything so far was 167. I actually thought the transducer was broken at first until I pulled over and it climbed up to 171-173.


2015 Ram 3500 Laramie Longhorn CC LB Dually. Cummins, Aisin, 4X4, 4.10. Max towing-28,750. Max payload-5,436.
2016 DRV Mobile Suites 41RSSB4

The Aisin trans runs cool! Here is a pic on a long 5% grade about 5 miles into it. Vantage Pass Westbound I-90 WA State. 32,500# combined weight.

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Old 08-30-2015, 05:53 PM   #6
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Cummins - - What's ALT TRAILER HT? I haven't seen that on my '14.
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Old 08-30-2015, 06:59 PM   #7
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My Z71 1500 w/5.3 got to 250 degrees pulling my 25 foot travel trailer. Dry weight is 4950#.
This was on its maiden trip and I was pushing it pretty hard to see what it would do. I installed a large Trans cooler and tried again and peaked at 194. We just got back from VA and with normal driving and cooler ambient temperatures we peaked at 185.

250 is maximum for any transmission fluid.
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Old 08-30-2015, 07:25 PM   #8
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Originally Posted by Slamnslash View Post
My Z71 1500 w/5.3 got to 250 degrees pulling my 25 foot travel trailer. Dry weight is 4950#.

This was on its maiden trip and I was pushing it pretty hard to see what it would do. I installed a large Trans cooler and tried again and peaked at 194. We just got back from VA and with normal driving and cooler ambient temperatures we peaked at 185.



250 is maximum for any transmission fluid.
250? Hoofta. That's a bit toasty for me. And that is why I'm happy to have worked hard to put myself in a position to always buy new, haha.
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Old 08-31-2015, 12:19 PM   #9
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Cummins - - What's ALT TRAILER HT? I haven't seen that on my '14.
It's a secret!

It's what the truck with factory rear air goes into when a load is placed on the rear. It drops the rear about 1" from stock stance that is already lower than the trucks without the rear air. It maintains that ride height up to the rear axle rating.

Here is a pic with 5,900# pin weight. Truck sits the same if it has 2,000# pin.

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Old 08-31-2015, 01:06 PM   #10
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damn that is a sexy truck Cummins12V98! Love that dash!

My truck pulling about 8k lbs runs 190-195... until I get in traffic or stop and go.. then she climbs... seen 215 tops... I hate traffic / stop and go!
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Old 08-31-2015, 02:31 PM   #11
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damn that is a sexy truck Cummins12V98! Love that dash!

My truck pulling about 8k lbs runs 190-195... until I get in traffic or stop and go.. then she climbs... seen 215 tops... I hate traffic / stop and go!
Thanks for the compliment!

I really like the dash also. Big improvement from my 11 LongHorn Dually.

My Aisin trans will warm up a bit but seems to stay cooler in stop and go than the 11 with 68RFE did.
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Old 08-31-2015, 03:24 PM   #12
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Well Cummins, I'm impressed! I also noted -
4th gear
2800 RPM
62mph
98 deg outside temp
High Turbo Boost, Maybe 32PSI
Equals to one hell of a grade and load!
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Old 08-31-2015, 06:08 PM   #13
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Mine never goes above 165F.
But another thing to watch is the rear diff. These can get brutally hot! Change that oil every 30k and if you do a lot of heavy towing, go with a 120 weight synthetic. An aftermarket cover ads cooling fins and oil capacity. A good spend.
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Old 08-31-2015, 09:11 PM   #14
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Well Cummins, I'm impressed! I also noted -
4th gear
2800 RPM
62mph
98 deg outside temp
High Turbo Boost, Maybe 32PSI
Equals to one hell of a grade and load!
I may have mentioned it but my last 11 HO RAM Dually losing that same grade with 30K combined pulled it at 58mph.

I am truly impressed with this truck. I just think back to my 98 12V and all the things I had to do to make power and then make it dependable thru the drivetrain.

Nice to buy something that does not need any tweeking!

Can't wait to pull the Southern Oregon/Northern Cali I-5 this fall. I recorded my speeds with the last truck and rV at 30K combined. It will be fun to compare with 3,200# more weight.
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