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Old 10-15-2014, 03:01 AM   #11
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Never use it here in Florida
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Old 10-15-2014, 08:49 PM   #12
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I have a 6.7L cummins, auto. I think tow / haul is easier on the transmission when pulling the XLR 29HFS, even in FLA. Some on this forum mention their tow / haul keeps their transmixer out of top gear; I suppose there are differences between brands and models; gas or diesel. Mine shifts into 6th (5th and 6th are OD) while in tow / haul mode, and because its a diesel, it has a select-able E-brake which is only active when I turn it on; but boy, it will whoa the truck fairly aggressively with E-brake and tow / haul together... once or twice surprising the heck out of me! I vote to use E-brake all the time, and tow / haul when pulling a toy hauler. To each his own.
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Old 10-17-2014, 09:22 PM   #13
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using tow haul mode

I use t/h mode whenever pulling. I have found that around 60 mph, with the slightly larger tires than stock (285/75-16) , i get better fuel mileage in t/h mode. It raises the rpm to about 1700 and the truck gets in the range of 14.5 -16 mpg. With out, it gets in the neighborhood of 13-13.5
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Old 02-02-2015, 05:04 PM   #14
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i found on my 1500 sierra that tow haul seems to keep the 5.3 right in the power band. rather than trying to tow at just over idle it wont let the truck drop below a certain rpm and itwont shift under 2500. if im towing my 6x12 enclosed empty or lightly loaded i just put the truck in 4th or 5th on the highway and dont bother with TH, if i have a heavy load in there i use it, same with my 27 hfs, its always on. also i found that if youre towing at too low of an rpm the trans temps go up. good to keep an eye on those
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