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Old 09-05-2012, 10:45 AM   #11
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On a Chevy Allison (at least) it will lock the TC and increase the pressure which provides a lower operating temp.
Besides reducing your fuel mileage at higher loads it will save on your brakes as well.
Keep in mind the Cummings Tranny is an entire different animal

Right from the 2011 Chevy Owners Manual:
Tow/Haul is designed to be most effective when the vehicle and
trailer combined weight is at least 75 percent of the vehicle's Gross
Combined Weight Rating (GCWR). See “Weight of the Trailer” under
Trailer Towing on page 9‑94. Tow/Haul is most useful under
the following driving conditions: . When pulling a heavy trailer or
a large or heavy load through rolling terrain.
. When pulling a heavy trailer or a large or heavy load in
stop-and-go traffic. When pulling a heavy trailer or
a large or heavy load in busy parking lots where improved low
speed control of the vehicle is desired.
Operating the vehicle in Tow/Haul when lightly loaded or with no
trailer at all will not cause damage. However, there is no benefit to the
selection of Tow/Haul when the vehicle is unloaded. Such a
selection when unloaded may result in unpleasant engine and
transmission driving characteristics and reduced fuel economy. Tow/
Haul is recommended only when pulling a heavy trailer or a large
or heavy load.
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Old 09-05-2012, 11:37 AM   #12
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With my Dakota I always use the tow/haul mode whenever I'm towing the camper. Just seems to put a lot less stress on the trans with the changed shift points, and the motor doesn't work as hard.
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Old 09-05-2012, 12:50 PM   #13
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Quote:
Originally Posted by camper_Lucy
On a Chevy Allison (at least) it will lock the TC and increase the pressure which provides a lower operating temp.
Besides reducing your fuel mileage at higher loads it will save on your brakes as well.
Keep in mind the Cummings Tranny is an entire different animal

Right from the 2011 Chevy Owners Manual:
Tow/Haul is designed to be most effective when the vehicle and
trailer combined weight is at least 75 percent of the vehicle's Gross
Combined Weight Rating (GCWR). See “Weight of the Trailer” under
Trailer Towing on page 9‑94. Tow/Haul is most useful under
the following driving conditions: . When pulling a heavy trailer or
a large or heavy load through rolling terrain.
. When pulling a heavy trailer or a large or heavy load in
stop-and-go traffic. When pulling a heavy trailer or
a large or heavy load in busy parking lots where improved low
speed control of the vehicle is desired.
Operating the vehicle in Tow/Haul when lightly loaded or with no
trailer at all will not cause damage. However, there is no benefit to the
selection of Tow/Haul when the vehicle is unloaded. Such a
selection when unloaded may result in unpleasant engine and
transmission driving characteristics and reduced fuel economy. Tow/
Haul is recommended only when pulling a heavy trailer or a large
or heavy load.
Ditto, I use it always with camper
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Old 09-05-2012, 01:04 PM   #14
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I always use it because that's what it says to do in the manual.
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Old 09-05-2012, 01:52 PM   #15
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90% of the time I use it. It keeps my trany, AF, and oil temps down. If I see a long flat highway ahead I'll turn it off to help the MPG. But, if I have a strong headwind on a flat I'll keep it on.
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Old 09-05-2012, 02:13 PM   #16
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I use mine...still trying to figure out when I get the best gas mileage. Going to find out in the next few days...going to tow over Monteagle on I-24 about an hour's drive away. Also...Chevrolet owner's...do you access your vehicle's manual online?
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Old 09-05-2012, 02:48 PM   #17
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I tried it last weekend and didn't care for how it acted. It's pretty flat around here so I'll try it again at the end of month in the hills up north.
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Old 09-05-2012, 02:53 PM   #18
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Quote:
Originally Posted by EdJunior
I use mine whenever I am towing my 5th wheel (except when I stop and forget to engage it again!). As noted above, it activates the engine braking in our F-250's, and does all that other stuff. But it only shifts when needed. Since mostyou of my towing is on the flatter areas of Texas, it makes no difference in mileage for me, since my tranny stays in 6th gear once I get cruising. I think that holds for most with the tow/haul as well. If it's staying in 6th gear (or that highest gear for your truck/tranny), mileage is probably not affected much, if at all, and it will give you the engine braking if needed.
you know , a couple of times this last week end I stopped the truck, and got back in to go and tow/haul was still on when I started truck????..normally it turns off when I turn truck off?.....hmmmm
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Old 09-05-2012, 07:55 PM   #19
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Quote:
Originally Posted by ironj View Post
you know , a couple of times this last week end I stopped the truck, and got back in to go and tow/haul was still on when I started truck????..normally it turns off when I turn truck off?.....hmmmm
Really? Hmmm, maybe an update to the 2012's?? Interesting!
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Old 09-05-2012, 10:18 PM   #20
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So... are some here trying to believe they're smarter than the engineers and mechanics who built and designed these trucks?

If the manual says to use tow/haul mode when towing or hauling why would you think that it's not the right thing to do?
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