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  1. #1

    Default Pulling a trailer and tow/haul mode?

    I have a 02 gmc sierra. I have to replace the tow/haul button and shift lever which is a common problem that I am sure you guys all know of.

    It got me thinking about using the tow/haul mode more. I have pulled a lot of trailers and my last truck was a older manual. None of this fancy mode stuff.

    Is it necessary to use tow/haul mode? What exactly does tow/haul mode do? I have always heard never pull a trailer with your with the over drive option on. Is that always true or is there a weight ratio that my truck can pull without having to worry about using overdrive or tow haul mode? The most I plan on pulling is a 87 alumcraft competitor 16.5ft with a 50hp tiller motor. I dont know the exact weight of everything on that trailer.

    looking for any tips and information.

    Thanks

  2. #2

    Default

    Quote Originally Posted by theflatlander View Post
    I have a 02 gmc sierra. I have to replace the tow/haul button and shift lever which is a common problem that I am sure you guys all know of.

    It got me thinking about using the tow/haul mode more. I have pulled a lot of trailers and my last truck was a older manual. None of this fancy mode stuff.

    Is it necessary to use tow/haul mode? What exactly does tow/haul mode do? I have always heard never pull a trailer with your with the over drive option on. Is that always true or is there a weight ratio that my truck can pull without having to worry about using overdrive or tow haul mode? The most I plan on pulling is a 87 alumcraft competitor 16.5ft with a 50hp tiller motor. I dont know the exact weight of everything on that trailer.

    looking for any tips and information.

    Thanks

    The Purpose of the Tow/Haul Mode is to:
    ***Reduce the Frequency and Improve the predictability of Transmission shifts when pulling a Heavy Trailer or a Large or Heavy load.
    ***Provide the same solid shift feel when pulling a heavy trailer or a large or heavy load as when the vehicle is unloaded.
    ***Improve Control of Vehicle Speed while Requiring Less Throttle Pedal activity when pulling a Heavy Trailer or a Large or Heavy load.

    Automatic Transmission Equipped Vehicles are provided with a button at the end of the shift lever which when pressed enables Tow/Haul.
    ***When the button is pressed, the Tow/Haul has been selected. Tow/haul may be turned off by pressing the button again, at which time the indicator light on the instrument panel will turn off.
    ***The Vehicle will automatically turn off Tow/Haul every time it is started.
    ***Tow/Haul is designed to be Most Effective when the Vehicle and Trailer Combined Weight is at least 75% of the Vehicle’s Gross Combined Weight Rating (GCWR).

    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.
    __________________


    Edit.....as far as Towing in Over-Drive, IMO it Depends on the Tow Vehicle, it also Depends on the Weight of what's being Towed, and last where/what kind of Terrain your Towing.....Freeway/Highway, and/or up Hills/Mountains etc...

    When Towing my Boat, I Never Tow in OD.....with the Engine, Gears, and Size Tires I'm Running on my Truck....I Stay in 3rd, for me, I would rather Burn a Few Extra Gallons of Fuel, than Burn-up my Transmission.

    Here's one more piece of information and its regarding The Tow/Haul Not Working, which is Most likely due to the Wire/Wires that go down the Shifter, down to the base of the Steering Column, and down at the Base is where the Break of the Wire/Wires will be, below is a Video that shows how to repair the Wires for the Tow/Haul Button,

    Last edited by 99'HEARTBEAT; 04-21-2014 at 09:32 AM. Reason: Added Infor.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  3. #3

    Default

    Quote Originally Posted by 99'HEARTBEAT View Post
    The Purpose of the Tow/Haul Mode is to:
    ***Reduce the Frequency and Improve the predictability of Transmission shifts when pulling a Heavy Trailer or a Large or Heavy load.
    ***Provide the same solid shift feel when pulling a heavy trailer or a large or heavy load as when the vehicle is unloaded.
    ***Improve Control of Vehicle Speed while Requiring Less Throttle Pedal activity when pulling a Heavy Trailer or a Large or Heavy load.

    Automatic Transmission Equipped Vehicles are provided with a button at the end of the shift lever which when pressed enables Tow/Haul.
    ***When the button is pressed, the Tow/Haul has been selected. Tow/haul may be turned off by pressing the button again, at which time the indicator light on the instrument panel will turn off.
    ***The Vehicle will automatically turn off Tow/Haul every time it is started.
    ***Tow/Haul is designed to be Most Effective when the Vehicle and Trailer Combined Weight is at least 75% of the Vehicle’s Gross Combined Weight Rating (GCWR).

    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.
    __________________


    Edit.....as far as Towing in Over-Drive, IMO it Depends on the Tow Vehicle, it also Depends on the Weight of what's being Towed, and last where/what kind of Terrain your Towing.....Freeway/Highway, and/or up Hills/Mountains etc...

    When Towing my Boat, I Never Tow in OD.....with the Engine, Gears, and Size Tires I'm Running on my Truck....I Stay in 3rd, for me, I would rather Burn a Few Extra Gallons of Fuel, than Burn-up my Transmission.

    Here's one more piece of information and its regarding The Tow/Haul Not Working, which is Most likely due to the Wire/Wires that go down the Shifter, down to the base of the Steering Column, and down at the Base is where the Break of the Wire/Wires will be, below is a Video that shows how to repair the Wires for the Tow/Haul Button,

    I have posted this on another forum also and keep getting different suggestions on what settings/gears to use when pulling. My boat isnt extremely heavy since it isnt a glass boat, but with the hills we have around most of our lake country it would make more sense to pull in third gear.

    I really dont see the reason why not to pull in fourth gear/OD as long as my rpms arent constantly changing and my truck is shifting every couple minutes.

    I guess I should of really put in my topic why shouldn't I pull in fourth gear/OD?

  4. #4
    Jr. Apprentice
    Join Date
    Mar 2014
    Location
    Georgian Bay, Ontario
    Posts
    10

    Default

    I am assuming that you have the 5.3 with the 4l60e combo. The reason most people would recommend not towing in overdrive is because with this tranny, there are only two od clutch plates and with the constant unlocking of the torque converter it would generate quite a bit of heat. Most of this is dissipated through the tranny external cooler.

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