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Old 02-28-2015, 04:52 PM   #31
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I never tow in bad conditions. I grew up in MD and NJ driving in snow and ice and this works really well for me. Maybe because the way in which I do it using engine combined with brakes?
I agree it works when not towing, but it is a definite No No while towing.
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Old 02-28-2015, 09:27 PM   #32
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I only use tow haul when I need it, mostly stop and go driving and hilly side roads. The more you can use overdrive the better the gas mileage as long as it's not at the expense of brakes and the transmission. Transmission temperature is the big limiting factor.
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Old 03-01-2015, 09:05 AM   #33
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I only use tow haul when I need it, mostly stop and go driving and hilly side roads. The more you can use overdrive the better the gas mileage as long as it's not at the expense of brakes and the transmission. Transmission temperature is the big limiting factor.
There are diffences with the brands and maybe whether gas or diesel truck. My Ram CTD (2012, 2500) runs top gear in TH mode. It just changes the transmission shift patterns, and it will shift down on a steep downgrade, when using the EB. You can have TH without the EB, or EB only with my truck. I had it on a 2010 Chevy half-ton, I can't remember what it did
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Old 03-01-2015, 09:12 AM   #34
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Right on pretty much for the Chevy to. The key is in how much the tranny stays in OD and how soon it upshifts to get there. That's money in your pocket. I suggest using TH only when needed. You get to determine when you need it. My rig seldom needs it. Newer trucks have more torque. I get around 12 MPG pulling a 38 CK modestly loaded.
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Old 03-01-2015, 09:27 AM   #35
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I always use T/H mode while towing, not only does it increase shift points, it locks the TC very early. It also helps a great deal while downshifting and holds gears to use the high compression of a diesel engine for slowing, I love it. As far as an exhaust brake I use mine when towing also, it will stay engaged down to 20 mph. With T/H and the exhaust brake I don't need brakes very much. As far as a jake brake, these are NOT jake brakes, they basically just use the turbo to create the back pressure, you only hear the turbo whistle.
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Old 03-01-2015, 09:43 AM   #36
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Got no problem with that; it just sucks fuel.
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Old 03-01-2015, 09:55 AM   #37
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Nope, no Jacobs braking system here. That would blow the head(s) off our little trucks.
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Old 03-01-2015, 10:02 AM   #38
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tow/haul doesn't necessarily lock out overdrive. Still uses all 6 speeds of my Allison trans just the same as when not towing. It does change some of the trans functions that you don't feel in lots of vehicles, such as running more pressure. Would you rather save your trans or get another .5 MPG?
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Old 03-01-2015, 06:54 PM   #39
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tow/haul doesn't necessarily lock out overdrive. Still uses all 6 speeds of my Allison trans just the same as when not towing. It does change some of the trans functions that you don't feel in lots of vehicles, such as running more pressure. Would you rather save your trans or get another .5 MPG?
Thats a no brainer, the .5 mpg hands down. You would only take one gazillon years to break even, then save, save, save!
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Old 03-11-2015, 09:41 AM   #40
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I have a 2012 Silverado with a D/A. I use tow haul 99 percent of the time. Our trucks don't want to shift into overdrive until about 67-69 mph on the flat. So what I do is once up to my cruising speed of 64-65 mph I disengage the tow haul, the transmission shifts into overdrive, then I re-engage tow haul and go merrily along my way in overdrive. Other option is to get up to 67-68 mph and let up on the pedal and it shifts to overdrive, set the cruise at 65 and go merrily along the way.
Exhaust brake, I use in hilly terrain and once I exit the expressway. I like the extra help with stopping.
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