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Old 04-16-2015, 10:21 PM   #1
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Tow Mode?

How many tow in tow mode?
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Old 04-16-2015, 10:26 PM   #2
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I just started towing a tt but have towed a dump trailer for years and always use tow mode. i'll manually put it into 5th on the highway if its shifting between 2 but always tow mode.
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Old 04-16-2015, 10:31 PM   #3
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Pretty much always . Changes the shift point of the tranny, inhibits overdrive and keeps tranny temp down. I also understand that on my new 3500, that it impacts trailer brakes and exhaust break functions
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Old 04-16-2015, 10:37 PM   #4
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We just got back from a 750 mile trip today. I towed our 30 foot DSRE White Hawk (less than #7500 loaded) out of tow mode with the cruise set with no problems and got 12.5 MPG round trip with lots of rain, some wind and some sun. The land here is as flat as it gets. At 64 MPH the truck is running at 1500 RPMS, in tow mode the truck ran 2250?? at 64 MPH. The truck does not seem to be in labor. Trans temp ran 135 degrees.
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Old 04-16-2015, 10:40 PM   #5
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With the duramax and Allison in tow mode it's a tow beast and with the exhaust brake turned on, slowing down and going up and down the mountains is a breeze. I would hate to smoke a transmission for not using tow mode in the mountains and hills.
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Old 04-16-2015, 10:50 PM   #6
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I always use tow mode, that's what it's for. I find that even though the engine is revving higher, it seems to not be working as hard, and I get slightly better gas mileage.

Last year I was pulling the trailer out of the winter storage yard, pressed the tow/haul button, and nothing happened. No light on the instrument panel, no transmission downshift, nothing. When I got home I did some Google searches, read a couple of websites and watched a video. It was just a simple broken wire in the steering column. I spliced it back together and all is well.
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Old 04-16-2015, 11:40 PM   #7
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For me it's tow mode, always. A little less mileage, a little more money for fuel, I'll take that over a $2K tranny re-build. I had one go south on me a few years back. It was no fun nursing that rig 700 miles back home. When they pulled the torque converter out there was no paint left on it and the steel was blue from the heat. I was told that the stator inside the TC has electro magnets on it that lock on to the inside of the TC case to give you that final overdrive. When the torque of the engine overcomes the strength of the magnets it causes the magnets to slip creating metal on metal friction and cooks the fluid. As the fluid loses its lubricity you get galling and metal debris is circulated throughout the tranny causing problems in other areas. It just goes downhill from there. The best solution is to not let the converter lock up. You do that by towing in tow mode. That is what I was told and I believe it. Your experience may differ.
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Old 04-17-2015, 07:32 AM   #8
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I always use TH when towing.. just wish when I stop for coffee/fuel it would stay in TH rather than have to reset it all the time
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Old 04-17-2015, 08:07 AM   #9
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Tow Mode all the time - unless I forget, which doesn't happen often anymore since it's on the DW checklist.
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Old 04-17-2015, 08:24 AM   #10
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Yup. TH Mode all of the time when towing. Manages the engine especially when going up and down hills.

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