14,000 lbs : Is Tow Haul Mode necessary? - Chevy and GMC Duramax Diesel Forum
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post #1 of 39 (permalink) Old 06-21-2019, 11:33 AM Thread Starter
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14,000 lbs : Is Tow Haul Mode necessary?

Hi,

I've got a 14,000 lb 5th wheel that I'm finally going to start using. My truck is a stock 04 3500 Silverado diesel dually 4x4. Is Tow Haul mode only helpful for the braking effect, or are there other reasons to use it?

Thank you.

Stummer

p.s. I've got an Insight CTS computer with an EGT probe installed.

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post #2 of 39 (permalink) Old 06-21-2019, 11:40 AM
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Unlike a gasser, your T/H restores the Allison to function as it was built....a truck trans to tow with.

Disabling T/H calms and tames it down for proper Mall cruising, like an SUV.

Your fuel use will drop, along with your EGTs, using T/H anytime you hook onto a trailer.

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post #3 of 39 (permalink) Old 06-21-2019, 12:13 PM
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I think it raises shift points to maximize pulling power but to me also increases shift speed or firmness probably to help protect tranny while pulling all that weight. Just my thoughts as I have no real data to support this. But my truck definitely seems to shift more aggressive or firmer when this feature is turned on.


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post #4 of 39 (permalink) Old 06-21-2019, 12:15 PM Thread Starter
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Thank you Hook. That's very useful information. I've towed the big 5th wheel a few times without putting it in T/H mode, because I don't like the braking effect. And towed smaller things like my boat. No major hills.

I wonder if I've damaged the transmission?

04.5 LLY Allison 3500 LS eclb drw 4x4, 3.73 axle, auto trans, 32,000 miles only

edge insight CTS w/ fusion update; diamond eye 4" dp back quiet tone w/ muff, transfer case pump rub fix

07 toy hauler dry weight 14,000lbs GVWR 18,000lbs

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post #5 of 39 (permalink) Old 06-21-2019, 12:39 PM
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No I would highly doubt it. Over a long period it might not be good for it though


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post #6 of 39 (permalink) Old 06-21-2019, 07:27 PM Thread Starter
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Quote:
Originally Posted by Sawtooth View Post
No I would highly doubt it. Over a long period it might not be good for it though


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Just got home. Okay, thank you Sawtooth.

04.5 LLY Allison 3500 LS eclb drw 4x4, 3.73 axle, auto trans, 32,000 miles only

edge insight CTS w/ fusion update; diamond eye 4" dp back quiet tone w/ muff, transfer case pump rub fix

07 toy hauler dry weight 14,000lbs GVWR 18,000lbs

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post #7 of 39 (permalink) Old 06-24-2019, 07:59 AM
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TH does raise the shift points to get the load moving and make use of torque. It also makes them more firm which requires higher pressures which keeps the slippage between shifts to a minimum which lessens the heat. Locks up the converter sooner as well. All of which accomplishes what Hook em stated above.

Why would you not want the braking effect when you are towing? I love mine-- don't have to use any brakes until later in the stop because the trans is already slowing rig down.

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post #8 of 39 (permalink) Old 06-24-2019, 09:48 AM
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T/H also initiated torque converter lock earlier and for longer. You will want that to keep the temp down and will provide more applicable power.



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post #9 of 39 (permalink) Old 06-24-2019, 12:56 PM Thread Starter
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OK, thank you sambor and sierraluva, I'm convinced. I hauled my little boat 4000lbs w/ trailer this weekend, and I went ahead and put it on, the T/H mode, I mean. Glad to know this, b/c I'm about to start doing a lot of hauling. My assumptions about "brake only" w/ T/H mode could have led to a failed transmission! Live and learn, thank you to the forum, and those who responded to this thread.
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04.5 LLY Allison 3500 LS eclb drw 4x4, 3.73 axle, auto trans, 32,000 miles only

edge insight CTS w/ fusion update; diamond eye 4" dp back quiet tone w/ muff, transfer case pump rub fix

07 toy hauler dry weight 14,000lbs GVWR 18,000lbs

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post #10 of 39 (permalink) Old 06-25-2019, 09:57 AM
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By using TH (to get the Turbo Braking) in any kind of mountainous terrain, in conjunction with Cruise Control and Manual Mode shifting to keep your RPMs between 1800 & 2400 you can use the truck to maintain a downhill speed of your choosing without using the brakes much if any.

It puts a smile on my face from ear to ear each and every time, just sitting and watching the truck work as it was designed to.
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Last edited by 407driver; 06-25-2019 at 09:59 AM.
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