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Old 06-29-2015, 09:32 PM   #1
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Trans temp..........

What is the typical automatic transmission temperature that I should look for when towing pulling approximately 7500-8000 pounds through hills and heavy start and stop driving ?? Driving a 2001 Chevy 2500HD w/6.0 Vortec with 4.10 gears.

Thanks !

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Old 06-29-2015, 09:43 PM   #2
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Anything in the 200* range and I start to get nervous after a few minutes. That said, on my 07 dodge 2500, it typically ran in the 190-200* range.

My new Ram 3500, with the new tranny cooler, only got to 180* on a recent major pull through Colorado high country.

Below is a basic matrix of damage caused by high temps

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Old 06-29-2015, 09:57 PM   #3
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My Tundra has the factory towing package and the Tranny temp hardly ever changes even when driving hard in the mountains towing or not. The Tundra comes with a 430 rear end and HD Tranny cooler with the tow package. I would assume your 2500HD would be similar. What kind of temps are you getting?
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Old 06-29-2015, 09:58 PM   #4
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IIRC, GM doesn't want it going over 240. Granted it was the 5.3, but I had my Sierra 1500 close to that once or twice, and I was worried.

Now my RAM 2500 rarely reaches 180.

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Old 06-30-2015, 07:54 AM   #5
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Short bursts of 220/230 don't hurt anything. It's the prolonged high temps that are bad. When your trans fluid smells burned, that's the time to be concerned.
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Old 06-30-2015, 09:04 AM   #6
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I have the same truck and gears, skidoorider but only pull about 5800 lbs. My trans temp is normally about 200 but on a long grade last week, it hit 230 and took about 10 minutes to come down. I read an article in Trailer Life recently that a guy with an older Silverado recommended only using the tow/haul button on long hills and leave it in OD or the trans temp will shoot up over 230. I think I had it in 3rd with the tow/haul button on when I hit 230.
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Old 06-30-2015, 09:32 AM   #7
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I have a 4L80E which is essentially a 4 speed version of the TH400 circa 1963. It runs about 200 degrees pulling 10K of trailer and cargo. I don't use tow haul mode. I did when I had the 5.3 and pulled a lighter hybrid but the 8.1 is a tow beast..
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Old 06-30-2015, 12:15 PM   #8
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It also depends on the air temp how hot it will run. Mine has also approached 200 on a hot day towing the 28BHS on level ground.....So I`m sure it would run hotter in the mountains. I switched to the synthetic Dexron VI from Dex III which the older GM`s had. The Dex VI has a higher tolerance of heat.

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Old 06-30-2015, 12:21 PM   #9
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My 05 Chevrolet 3500 with the allison transmission has never been over 180 degrees, even on the hottest days of the summer.
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Old 07-05-2015, 08:13 AM   #10
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I'm pulling approx. 8500 lbs with your same truck so I'm a good example. When towing I usually run about 100 degrees over outside temp. Now, that's running on the flats, not the mountains, but I don't think I've even been above 200 degrees.
I have the stock trans cooler up front and drain the pan more often than probably needed.
I've considered putting a TruCool 40K on it, but I'm not convinced it's needed just yet.

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