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Old 12-18-2014, 09:43 AM   #41
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Back to "tow-haul".... I'm guessing that the manufacturer put the tow/haul on the truck for a reason, so I use it whenever I'm towing/hauling. Also turn on engine braking to help slow down the 17,000 behind me a little quicker...
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Old 12-18-2014, 10:36 AM   #42
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You assume that they are over weight.


I'm overweight could use to lose 10 pounds...
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Old 12-18-2014, 10:51 AM   #43
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You are right turbs, And it is his right to leave the forum. I just don't understand why you need to comment on everyone's rig even if you don't know all the facts. You assume that they are over weight.
Your right I shouldn't point out the obvious
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Old 12-18-2014, 10:55 AM   #44
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A question brought up earlier was about trans temp not using tow mode. I have the Bully Dog tuner that displays trans temp, exhaust temp, intake temp, average fuel consumption, current fuel consuption, turbo boost preasure, engine temp, battery level, etc., etc.. It will also correct any DCT codes that might come up.
I show no difference in trans temp in or out of tow mode. I just put it in gear and let the Duramax/Allison figure it out. If it needs another gear, it will go for it. I figure those folks at GM and Allison are a lot smarter than I am.
Also, I drop 2 mpg from 60 to 70 mph. Cruise control stays on 65 mph if traffic will allow.
And yes, the tow mode WAS put on the truck for a reason, it's for IF you need it. That is why there is an on/off button.
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Old 12-18-2014, 12:38 PM   #45
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The tow/haul mode changes the shift points of the transmission so it provides better acceleration when taking off and assists with braking by downshifting earlier when slowing down. There should be no difference while cruising and it has nothing to do with transmission temperature.
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Old 12-18-2014, 12:49 PM   #46
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We have a 2002 Chev Silverado (the large engine and all the extra STUFF as my wife calls it on the vehicle) and a Rockwood 2010yr. 2604 and I always use the tow mode (unless I forget and my wife reminds me) and as my service mechanic said that is what it is there for and let the transmission do its thing. In Canada eastern Ontario, we have towed it to the west coast, through the rockies and no problem. As I was told to use it as it is cheaper than replacing a transmission for the little more gas it uses.
By the way my truck just turned over the 100,000KMS this past summer.

Enjoy the Christmas season
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Old 12-18-2014, 12:51 PM   #47
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Incorrect, oakprk. It is very important during cruising and for trans temp. It does change the shift pattern for acceleration and deceleration.

But it also increases the fluid pressure so you put less wear on the clutch packs during shifting, and it moves the heat out to the tranny cooler faster. I definitely see a difference in the tranny temp when I use tow/haul under stress conditions - like a long climb on a warm day.

Some trucks do other things, too. I believe all of them now enter into an engine braking mode which auto-downshifts when you hit the brake on an incline. With it off it still has engine braking (closing valves and cutting fuel) but it doesn't downshift. Mine also changes the tap-for-turn-signal from 3 blinks to 6. Supposedly it increases the output voltage from the alternator but I've never seen that happen.

On mine is says you don't need to use tow/haul unless you are over 50% capacity. I would have to check if that was GCVW or tow capacity.
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Old 12-18-2014, 12:52 PM   #48
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Originally Posted by oakprk View Post
The tow/haul mode changes the shift points of the transmission so it provides better acceleration when taking off and assists with braking by downshifting earlier when slowing down. There should be no difference while cruising and it has nothing to do with transmission temperature.
Not true at all.
At least on gm the trans stays in a lower gear "higher" rpm when tow haul is engaged.
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Old 12-18-2014, 12:53 PM   #49
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Maybe your crv tv is the way you speak but not gm
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Old 12-18-2014, 01:03 PM   #50
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As I understand it the "THMode" is mainly for starting from a stand still...Tranny decides when it should shift....My 2014 Silverado 2500HD is quite and really helps to pull our CC Silverback 29......You should not notice anything once rolling on a level...may shift differently on a long grade...J
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