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06-08-2015, 10:35 AM
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#1
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Junior Member
Join Date: Apr 2015
Posts: 4
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Tow/Haul mode with TT
Hi all, I'm a newb to the forums, and somewhat to towing a TT. The last camper was a Coleman tent trailer. We bought a 2015 GMC Sierra with the 5.3 V8 and a new Passport TT dry weight is about 4800 Ibs. We are planning a long trip across Canada and I was wonder about the advantages or dis advantages using the tow/haul mode.
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06-08-2015, 11:10 AM
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#2
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Senior Member
Join Date: Sep 2013
Location: Waynesville Georgia
Posts: 1,307
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tow/Haul Mode minimizes the shifting of the transmission, keeps trans and engine cooler. I always use tow/Haul when towing.
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06-08-2015, 11:15 AM
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#3
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Community Administrator
Join Date: Aug 2009
Posts: 53,557
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My MH experience with a Ford F53 Gas engine was that the tow haul worked great on hills up and down however reduced my mileage by 1 MPG. Not sure if this is applicable to your situation but I thought it would be worth looking into. YMMV
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Cliff,Tallulah and Buddy ( 1999-2012 )
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06-08-2015, 11:20 AM
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#4
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Senior Member
Monaco Owners Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 6,196
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Basically what tow haul does is 'hang' in gear a bit longer when accelerating and drop down a gear quicker when slowing...
It all depends on your load and the capabilities of your drive train...
either way won't 'hurt', but for us, we never used tow haul except to turn it on to help with engine braking...
but, our engines had more than enough power to pull what we were towing/hauling... YRMV
good luck and it's YOUR combo - try with or without and figure out which seems best to you 
__________________
'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk(junk!), 11 MVP Destiny, Open Range TT, Winn LeSharo, C's, popups, vans, tents...
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06-08-2015, 11:40 AM
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#5
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Senior Member
Join Date: Sep 2013
Location: Waynesville Georgia
Posts: 1,307
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True Tow/Haul may reduce gas milage slightly, but it's benefits far outweigh that, less strain on your trans. temps .
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06-08-2015, 11:50 AM
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#6
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Apr 2015
Location: Western WI
Posts: 688
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When towing use it, it changes the shift patterns to save your tranny and engine.
Sorta pay me now or pay me really big bucks later.
__________________
2001 Itasca Horizon 36LD Cat
Retired Air Force, One lovely Angel  , 2 Cats and three birds.
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06-08-2015, 11:57 AM
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#7
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Senior Member
Join Date: Apr 2014
Location: Austin,TX
Posts: 464
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I use it every time I tow. I'd rather pay a smidgen more in gas and take better care of our new truck.
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06-08-2015, 11:57 AM
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#8
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Member
Join Date: Jun 2014
Location: Where my wheels are
Posts: 85
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Are you using a weight distribution system? sway bar? TT have breaks (if so do you have a control in your truck?)
I always use it up and down hills mostly. I like it.
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2013 Rockwood 8523 TT - 2007 GMC Sierra 2500HD Diesel - Buster & FlipperDoodle (cats). - Full-timer from NorCal.
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06-08-2015, 12:24 PM
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#9
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Senior Member
Join Date: Sep 2013
Location: Waynesville Georgia
Posts: 1,307
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Good Questions GVJeeper Have to know what he has to get started correctly. Thankfully i had a Son In Law already into TT to get me started . Not that he was always correct,but a big help !!! 
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06-08-2015, 01:12 PM
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#10
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Junior Member
Join Date: Apr 2015
Posts: 4
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Thanks for all the info. Yes I guess I did forget a few details. I have a weight distribution hitch. Tandom axle with electric brakes. Truck has built in trailer brake.
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06-08-2015, 03:34 PM
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#11
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Senior Member
Jayco Owners Club
Join Date: Mar 2012
Location: Weatherford, TX
Posts: 975
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Quote:
Originally Posted by sincky64
Thanks for all the info. Yes I guess I did forget a few details. I have a weight distribution hitch. Tandom axle with electric brakes. Truck has built in trailer brake.
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OK, but how close are you to your towing limits? If you're more that 50% of that limit, you should be using it... in my opinion. It's there for a reason. The designers of your tow vehicle engineered it to keep the heat buildup and loads on that vehicle down as much as possible. My truck is capable of towing about 16K and my TT is about 7,200 loaded, but I still use it anytime I tow. Safe travels...
__________________
Jack and Dee Dee Weatherford, Texas
2014 Ram 2500 Crew Cab 4X4 w/CTD 6.7
2016 Jayco White Hawk 28DSBH Travel Trailer
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06-08-2015, 04:17 PM
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#12
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Senior Member
Join Date: Sep 2013
Location: Waynesville Georgia
Posts: 1,307
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I have always gone by a 20% safety factor, now this is going to open a whole new can of beans !!!!
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06-08-2015, 05:18 PM
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#13
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Senior Member
Join Date: Apr 2015
Posts: 412
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I'm sure the manufacturers build in a margin of safety, don't tow over the trucks ratings and you will be fine.
__________________
2022 Entegra Vision XL 36C
2015 Gateway 3650BH (sold)
2005 F250 CC 4x4
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06-08-2015, 06:17 PM
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#14
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Senior Member
Join Date: May 2014
Posts: 568
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My tow mode prevents the truck from going into the last gear and also makes the shifting more drawn out.
I only use when going up or down hills....
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Linear Mode
