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Old 03-15-2014, 04:14 PM   #11
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On our two GM diesels, the tow haul mode will change the shirt points to allow for more torque, I believe, as you are gaining speed by holding the transmission in gear before it shifts up. On the first GM diesel, it also had an overdrive lockout on the wand which worked well, but I didn't really need it with the diesel. Haven't noticed whether the overdrive lockout is on this new GM diesel. I don't believe that tow/haul suppressed the overdrive all by itself, it only really did that when the overdrive lockout was activated.
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Old 03-15-2014, 05:33 PM   #12
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Now I want to go back and read/ test on the Dodge
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Old 03-15-2014, 08:04 PM   #13
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I use tow/haul whenever I tow/haul and sometimes I use it during normal driving because it makes the truck a bit more peppy.
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Old 04-19-2014, 08:29 AM   #14
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I brought home our just purchased 23J a few weeks ago and had the tow/haul feature engaged on my F150. Soon after hitting around 100kmh, the dash display coded a wrench picture. I pulled over and checked out the reason and it said that it could be a 4 wheel drive sensor and would limit shifting. Made it home fine and a few hours later I checked it and the wrench code wasn't there.

Now I wonder whether I should have turned the tow/ haul off on the highway.
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Old 04-19-2014, 09:19 AM   #15
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Whether you use the tow-haul on the highway or not shouldn't make any difference with the four-wheel drive system. It's a transmission system designed to delay, a bit, the shift points when you are accelerating, so that you will have a bit more torque as you go up the gears. I would suggest you take your truck into the dealer and ask them about this. They may have some equipment they can plug into the truck to see if they can find out what happened.
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Old 04-19-2014, 11:16 AM   #16
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My F250 info center says to use tow haul when towing up/down hills but can disengage on flat ground to save fuel. Agree with all the shift point info given above both up and down hill.
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Old 04-19-2014, 07:25 PM   #17
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Quote:
Originally Posted by t2daniel View Post
My F250 info center says to use tow haul when towing up/down hills but can disengage on flat ground to save fuel. Agree with all the shift point info given above both up and down hill.
Agree as well with all the above. My F-250 in tow/haul slows me down even on the slightest hills. I barely/rarely have to use my brakes and I'm towing 9200lbs.
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Old 04-20-2014, 11:56 PM   #18
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I always use tow haul with my Dodge. I found that towing our trailer in 5th gear gives the best fuel mileage and the transmission pretty much stays in 5th. I have a pyrometer and the temps are cooler when I don't use 6th.
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Old 04-21-2014, 12:21 AM   #19
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I use tow/haul on my 2013 f150 generally when going down hills to keep the revs lower and use the brakes less.
If you are starting on a hill going up it is also the most preferable way to start as it gives you better gear ratios to deal with the hill.
On the highway I would definitely not use it as it will severely hinder your gas mileage.
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