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Old 06-21-2019, 08:18 AM   #29
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We call it "Toy Haul" since it's hauling our toy, and yes, we use it always on our 1500 Ram.

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Old 06-22-2019, 11:05 AM   #30
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I tow with a 2008 Chevy 2500 with the 6.0L gas engine. When we first got the 28' FC I tried the Tow Mode and found it kept the rpms too high and have never used it since. Seems the Tow Mode is only needed when towing 10,000# or more (13,300# is the max on my truck). We have gone over most of the high passes in Colorado several times and never used Tow Mode. On descent, I switch to Manual mode and control my gearing as I see fit. Tranny temp and brakes have never over heated, going up or down these 11,000+ passes.
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Old 06-24-2019, 08:32 AM   #31
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Originally Posted by dkdouglas View Post
I tow with a 2008 Chevy 2500 with the 6.0L gas engine. When we first got the 28' FC I tried the Tow Mode and found it kept the rpms too high and have never used it since. Seems the Tow Mode is only needed when towing 10,000# or more (13,300# is the max on my truck). We have gone over most of the high passes in Colorado several times and never used Tow Mode. On descent, I switch to Manual mode and control my gearing as I see fit. Tranny temp and brakes have never over heated, going up or down these 11,000+ passes.
Your comment above is not true:
Seems the Tow Mode is only needed when towing 10,000# or more
Not accurate in todays vehicles. The computer's in the newer models will control the engine speed and gearing when Tow/Haul mode is selected, regardless of the size load you have. If you think your 2008 is not working properly, it typically can be adjusted. If you read a few threads here on this post, you will note a few folks commenting how it controls shifting and in turn also controlling engine speeds/RPM. I have always found it to be a value with my older Ford vans, 2008 and 2011Tahoe's, my 2012 F150 EB, and now on my F250, where it helps going up and down mountains at highway speeds...especially when towing and using cruise control with my diesel. I use it many times without towing also, going up steep mountains here in Lincoln MT to help keep steady speed without working the transmission shifting. YMMV
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Old 06-24-2019, 08:45 AM   #32
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Tow Haul Button - does it matter?

Sometimes I use tow mode, sometimes I don't.......

Sometimes I find the higher shift points annoying and un necessary, especially in stop and go city driving.
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Old 06-24-2019, 08:48 AM   #33
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Sometimes I use tow mode, sometimes I don't.......

Sometimes I find the higher shift points annoying and un necessary, especially in stop and go city driving.
10-4, in town when acceleration loads are not great, I too turn it off. Normal 30 - 45 mph limit streets or creap and stop, rinse. repeat.
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Old 06-24-2019, 09:25 AM   #34
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For me in my gas Silverado 2500, unless I am in the mountains, I leave it off, and enjoy another mile per gallon.
On GM 1500 trucks at least since 2007, Tow/Haul also increases the generator minimum charging voltage in an attempt to better charge the trailer batteries. With Tow/Haul off, the generator output may drop as low as 12.8V when the truck senses that the truck battery is fully charged . . . to increase fuel economy . . . but this voltage won't effectively charge a discharged trailer battery. With Tow/Haul on the minimum charge voltage about 13.5V.

As far as I know, this is not the case in GM 2500 and 3500 HD trucks (I think their minimum charging voltage is about 13.5V), at least thru 2019. Not sure about the new 2020 HDs.
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Old 06-24-2019, 09:34 AM   #35
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On GM 1500 trucks at least since 2007, Tow/Haul also increases the generator minimum charging voltage in an attempt to better charge the trailer batteries. With Tow/Haul off, the generator output may drop as low as 12.8V when the truck senses that the truck battery is fully charged . . . to increase fuel economy . . . but this voltage won't effectively charge a discharged trailer battery. With Tow/Haul on the minimum charge voltage about 13.5V.

As far as I know, this is not the case in GM 2500 and 3500 HD trucks (I think their minimum charging voltage is about 13.5V), at least thru 2019. Not sure about the new 2020 HDs.
No, I have observed the exact same behavior from my 2017 2500 as I did on my Silverado 1500. If not in T/H the voltmeter drops way down when the truck battery is charged. It stays above the mid-mark in T/H
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Old 06-24-2019, 09:42 AM   #36
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I have a F150 2017 Ecoboost with 10 speed transmission. When going up grades it is down at 7th. This helps if I have to accelerate for some reason. On level areas it will be in 8th to 9th gear depending upon my speed. But the big key is that if I put on the breaks the transmission automatically shifts down and helps in fast breaking to slow the trailer down. Also even when just coming up to a stop sign. On flat terrain you never know when you need it. My manual also says it is better for the transmission while towing. Otherwise the transmission may over heat. It took me awhile to get used to it because sometimes it really revs the engine up. But these engines do just fine at high rpms. And it is clearly makes things perform better when accelerating and stopping.
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Old 06-24-2019, 11:37 AM   #37
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Do some research for your brand, but for GM, it not only raises shift points, activates decel down shifting, but also raises line pressure to keep more clutch application force. GM recommends using it when gcw is at or above 75% of rated gcwr.
Local transmission teck says this the most important reason to keep TH on when pulling away, or stop and go traffic. Also says keep it on always when towing if I don't want to have to visit him.
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Old 06-24-2019, 01:20 PM   #38
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Local transmission teck says this the most important reason to keep TH on when pulling away, or stop and go traffic. Also says keep it on always when towing if I don't want to have to visit him.


And still my first transmission lasted 250,000 miles before I rebuilt it.

It failed not because of towing, but because a BB sized check ball worked its way into its seat on the valve body divider plate, depriving the overdrive clutch of sufficient pressure to keep the OD (and 2nd gear to a lesser degree) clutch plates from slipping.
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Old 06-24-2019, 01:37 PM   #39
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yes it does matter for my Explorer. ALWAYS press tow button before towing.
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Old 06-24-2019, 01:58 PM   #40
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Guys, all of the above could apply. For those of us who are techy types and know/feel their machinery and understand where they are with the robustness of their specs relative to their load can appropriately use or not use the th button. For the rest, leave it on while towing. To give advice otherwise or recommendations to novices wouldn't be prudent and would take a text book and tutoring to learn. Cant be done in a forum post.
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Old 06-24-2019, 08:00 PM   #41
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Guys, all of the above could apply. For those of us who are techy types and know/feel their machinery and understand where they are with the robustness of their specs relative to their load can appropriately use or not use the th button. For the rest, leave it on while towing. To give advice otherwise or recommendations to novices wouldn't be prudent and would take a text book and tutoring to learn. Cant be done in a forum post.


This post has it right.

You put that into words exceptionally dznf0g.
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Old 06-25-2019, 03:24 AM   #42
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I think you nailed it, tow/haul switch will be left on!
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