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Old 09-25-2012, 04:12 PM   #1
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Duramax Owners-Gear Question

When towing with the Duramax, we simply put it into drive, engage Tow/Haul button and mosey down the road.

Question-When do y'all move your shifter to third gear when towing and what was the reason to drop it in third and what was your speed and/or rpm levels?

This is just a generic question...was on my mind and thought to ask
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Old 09-25-2012, 04:23 PM   #2
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I put mine in drive and never drop it into any other gear unless I'm decending a hill, and even then, the engine brake usually takes care of it for me. There is no need to ever shift your Allison transmission during normal operation.
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Old 09-25-2012, 04:43 PM   #3
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Yes, you only want to shift manually if you want to increase rpms for some reason. Could be helpful in hilly terrain if the transmission is not downshifting to suit you, or it's hunting around for a gear.

I've never had that problem, as the auto does a good job. Generally don't use the tow/haul mode unless I'm heavily loaded (75% of max) and want to run at higher rpm. Also I engage the exhaust brake if in steep hills or in heavy traffic (urban areas).
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Old 09-25-2012, 04:51 PM   #4
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Here is how my manual reads page 424:

• If you have an automatic transmission, you can tow in DRIVE (D). You may want to
shift the transmission to THIRD (3) or, if necessary, a lower gear selection if the
transmission shifts too often, such as under heavy loads and/or hilly conditions. If you have a manual transmission and you are towing a trailer, it’s better not to use the highest gear. See Tow/Haul Mode Light on page 262.

Tow/Haul Mode

Tow/Haul is a feature on automatic transmission equipped vehicles that assists when pulling a heavy trailer or a large or heavy load. See Tow/Haul Mode on page 147 for more information. 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). See “Weight of the Trailer” later in the section. 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
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Old 09-25-2012, 09:08 PM   #5
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like those above I put it in drive with two/haul on and don't do anything else.
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Old 09-25-2012, 09:47 PM   #6
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I also have the Alison and I put it in tow/haul and drive.
It is always in the proper gear up or down hill.

The only time I reset it is on level highway and in cruise. If the transmission has not shifted into overdrive on its own due to the cruise speed, I punch it off; then back on after it upshifts.
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Old 09-25-2012, 09:48 PM   #7
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Ditto. No reason to shift. Occasionally will remove overdrive in certain conditions, but that's rare.
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Old 09-25-2012, 09:49 PM   #8
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Put mine in drive. Always use tow/haul mode and exhaust brake on. Pulling a 13k trailer I like the help the truck offers.
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Old 09-26-2012, 12:30 AM   #9
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My Dodge manual says to use tow/haul when towing or hauling. I don't use it unless it's hilly or windy. I'm probably about 73% of Gross Wt. TT about 6.7k, empty truck 7.4K, truck load 1.2K = 15.3K/21k.

Don't know where tongue wt figures into all that (the truck can handle another 1k load).

It usually runs fine on the flat without tow/haul -

(somebody with a 13K trailer must be nearly at 100% gross)

I saw a guy with my truck model at a rest stop South of Raton Pass with a huge 5er - he said it weighed 14.5K. I mentioned it was over the recommended max weight and he said it wasn't an issue with the 1 ton diesels.

.
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Old 09-26-2012, 09:23 AM   #10
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Quote:
Originally Posted by Chuckinca View Post

(somebody with a 13K trailer must be nearly at 100% gross)

.
Nope. You should pull the truck specs. before you throw out opinions.
I used the weight calculator, truck and trailer specs to make sure I still have a good safety margin. Plus it is not a Dodge.
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