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Old 04-15-2013, 08:31 PM   #11
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I've not gone far enough with the big TT yet but have pulled a car on a carrier 100 miles and got to 'play' a bit. 80F day, 55mph tow haul then 65 tow haul, then 60 in regular mode.
In regular mode MPG went to hell. from 15 to 13 almost immediately. I noticed nothing else. (return trip w/ empty trailer in tow haul 65mph got 17.1 avg)

Pulling my cargo trailer (2k lbs maybe) MPG is better in tow haul mode.

I've noticed grade braking comes on less in tow haul mode.

As for trans temps, I did watch it for a bit with the car carrier and say 135-145. Stopped at a rest stop and when I started back up it was up to 149 (went up parked) but dropped back down with a mile of driving.

Our first big outing will be in a month, about 85 miles to the CG. I'm going up alone mid week and the family will join on the weekend so I'll have lots of time to observe things.

Jill & Chris, Wills (14) Evie (11) & Toby our collie (5)
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Nights camped 2011: 11 2012: 18 2013: 12 2014: 12 2015: 13 2016: 3
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Old 04-15-2013, 09:28 PM   #12
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Tow Haul

Check your owners manual, mine states, that when driving on flat to semi flat ground, it is not necessary..only when your transmission starts wanting to go in and out of passing gear...been driving around the south only using it when asked for...great gas mileage increase...157,000 on 20001 2500HD GAS..Silverado Ext. Cab..

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Old 04-15-2013, 10:05 PM   #13
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I pulled my 7000# TT with my 2008 GMC 5.3 V8 last summer when the outside temp was 90 degrees. The tranny would run 190 F on the flats and up to 210 F on the big hills. No alarms going off. I was told that the fluid will hold up to 275 F, but needs to be changed more often depending on how hot you run it. I plan to change mine every 20,000 miles or less/
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Old 04-15-2013, 11:24 PM   #14
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Originally Posted by mduff View Post
Originally Posted by mduff View Post
It is understood that this changes the shift points for the transmission; shifts earlier, runs engine RPMs higher.
With a six speed transmission it is hardly noticeable.
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Old 04-16-2013, 02:18 AM   #15
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A alternative to the ScanGuage II at $160 that can show you even more information logged and real time, in addition to the ability to view and reset fault codes:

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torque obdii bluetooth | eBay

Back to the original discussion, temps around 150-170 towing up some hills in Eastern TN. As a practice, I usually monitor transmission temps and fuel ranges, so I don't know if it would come up automatically. Next trip will be only about an hour on flat roads to the Richmond NASCAR race, but if I see something come up automatically I'll repost.

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Old 04-16-2013, 05:01 AM   #16
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I have a guage on mine, it rerely goes above 200 degrees when I am towing my 12000 pound trailer. It sometimes will if I am going uphill. I have never seen it go above 220 Degrees. I also have a 4:10 rear end.
Scott & Vicki
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Old 04-16-2013, 05:02 AM   #17
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Temps 2500hd gas 6.0 3.73 trans 133-144 flat 160 mountains....w tow haul....
No tow haul on the flat.....only when up and down hills...then tow haul....truck loaded and towing 8500....GCW 15000 to 15500.....GCWR 16k

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Old 04-16-2013, 06:37 AM   #18
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When I had my 2005 2500hd gasser and 13k + trailer 190 -200 degrees towing no matter what with a hayden thermostatic controlled electric fan.

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Old 04-16-2013, 06:41 AM   #19
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I think I discovered what happened. I went back out to the truck and scrolled through the screens, and it happens that the transmission temp screen comes up right after the trip meter screen. I think when I started out I pulled up the trip meter, pushed the button again to reset the mileage and didn't notice that I didn't hold the botton long enough for the reset. Instead, I moved to the next screen in the rotation, which was the transmission temperature. So, I'm speculating now that it didn't pop up on its own at all. I think it was operator error and lack of attention to detail.

Thanks to all who answered. I actually got some very good and useful information out of the discussion. Next time, I'll try not to panic before analyzing the perceived problem.
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The world is a great book, of which those who never stir from home
read only a page. - St. Augustine
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Old 04-16-2013, 02:38 PM   #20
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Originally Posted by mduff View Post
Our TT is approximately the same weight range, no issue with towing although only a couple of times late last season. Assuming that your towing package included the transmission cooler (just a thought); we installed one on our previous 4.8 Silverado and it made a significant difference on the transmission temperature.

It is understood that this changes the shift points for the transmission; shifts earlier, runs engine RPMs higher.
It also changes the voltage to the 12 volt charge line, but that is beyond the scope of this thread. There may be other things that tow/haul alters.

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