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Old 07-06-2015, 07:57 PM   #21
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on 05 gm dura max using tow haul locks up the converter which runns the trans cooler ,i dont know about increasing the voltage to the TT, but i will check it out.
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Old 07-06-2015, 08:48 PM   #22
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Originally Posted by gmacklem View Post
When I was towing my travel trailer with my F-150, I turned overdrive off. But now with the Sunseeker, I am getting ready to tow a Honda CRV. Should I have tow/haul mode on or off for towing with a class C?

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Old 07-06-2015, 10:11 PM   #23
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They have a tow/haul on there for a reason. With today's computer driven vehicles, the dealer can tell if you towed with out it on and let's say you burn up a trans, it's on you if they can prove it and want to prove it. I use it because it was made to use when you are towing or hauling heavy loads. I've seen a lot of remarks over the years about the tow/haul mode, I don't understand why you wouldn't want to use it. Saving a gallon of gas (if it saves any at all) versus a new trans, I'll pay for the gas.
Yep, same here. My truck logs all miles connected to a trailer...tow/haul better had been activated.
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Old 07-06-2015, 10:40 PM   #24
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I have a 2015 GMC Sierra 1500. First, i have never heard of "Increased Transmission Fluid to the Cooler". I am not saying it isn't true, just saying i never heard of it. I DID read in the OWNERS MANUAL, that shifting to Tow Mode does increase the power output from the alternator. But more importantly i think i read that when the COMPUTER/STABILITRAC realizes that there is a trailer with another set of brakes, it utilizes this as another safety feature to keep control of a vehicle under emergency circumstances. I do not know if this happens only when in Tow Mode, or if it happens simply when a trailer is plugged in, but it is something to consider.

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Old 07-06-2015, 11:10 PM   #25
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Also tow hual mode increases your blinkers from 3 times to 6 times on later models when you use the lane change feature.


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Old 07-07-2015, 09:17 AM   #26
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Also tow hual mode increases your blinkers from 3 times to 6 times on later models when you use the lane change feature.


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Shudda read my owner's manual. I wondered why it was 3 sometimes and 6 at other times. Thanks.


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Old 07-07-2015, 09:21 AM   #27
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Shudda read my owner's manual. I wondered why it was 3 sometimes and 6 at other times. Thanks.


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Old 07-07-2015, 09:32 AM   #28
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Old 07-07-2015, 10:28 AM   #29
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One thing I've learned from the many tow/haul threads on this forum (and others) is that readers should NOT accept as gospel all the general comments made about T/H functions. Although these are on the internet, they are not across the board true. One might write "T/H causes ________" and it might on their vehicle but it doesn't on others. T/H is not created equally across all years nor across all lines. I've read "T/H locks out overdrive (or high gear)", but it doesn't on mine. In T/H mode, my truck will tow my trailer in 6th (high) gear (my two top gears are overdrive) AND in 4 cylinder mode.

Word to the wise: when you read something here about tow/haul mode, don't automatically believe it. Check with your owner's manual (or with Turbs - or is it Turns?) about the T/H function of your specific vehicle.
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Old 07-07-2015, 10:41 AM   #30
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If it has (T/H) use it if you are (Towing or Hauling) it is REAL NICE going (Down Steep Grades) also! Youroo!!
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