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Old 06-08-2015, 10:05 PM   #15
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My last 2 trucks use 6th gear when in tow/haul. The computer permits it if the load isn't bearing down on it too bad. I can lock out 6th gear if I choose to, because of headwinds, or a really long hill. The shifting back and forth heats the transmission, and my '14 Ram will keep this from happening when in tow/haul. I came back almost all the way from Phoenix in 6th. My '11 F-150 wouldn't get to 6th gear in a head wind.
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Old 06-08-2015, 11:07 PM   #16
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I have been using Tow/Haul when towing and it seems to do much better overall. My mileage seems to be about the same.
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Old 08-19-2015, 10:16 PM   #17
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buy a scanguage2 or a bluetooth OBD scan tool for a smartphone to monitor transmission temps and such for $100 to $200 it can tell you if temps are getting out of control
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Old 08-19-2015, 11:07 PM   #18
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If you don't have a transmission temp gauge, then use tow/haul mode since this can help keep temps in the tranny down and decrease shifting with a load. If you can monitor tranny temp and drive on flat terrain, than you can use what works best according to the info you can get from the tow vehicle.

When in doubt, use tow/haul.
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Old 08-19-2015, 11:15 PM   #19
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Quote:
Originally Posted by schrederman View Post
I came back almost all the way from Phoenix in 6th. My '11 F-150 wouldn't get to 6th gear in a head wind.
It's all about having enough truck and torque to get the job done.
Nice isn't it.
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Old 08-20-2015, 04:03 PM   #20
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I always use Tow/Haul mode when towing.
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Old 08-20-2015, 04:11 PM   #21
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Well, you don't have any moisture in your oil after that at least.
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Old 08-20-2015, 06:12 PM   #22
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Use tow / haul for sure,, its there for a reason when pulling heavy loads. I'm running about the same kind of truck a '14 1500 Silverado 5.3 3:42 axle, pulling a 7,600 lb. 31 ft. Laredo TT. Keep an eye on your trans. temps its on your DIC.
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Old 08-21-2015, 05:04 AM   #23
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According to the local Ford tech, tow\haul also increases transmission shift pressure for firmer shifts. This reduces heat and improves durability and IMO that's enough to warrant it's use whenever hooked to a trailer regardless if you prefer the shift pattern change.
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Old 08-28-2015, 05:56 AM   #24
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If your truck's owner's manual states that you should use the tow haul mode when towing, I would do so. I always use the tow haul mode and figure that it's designed to help prevent any transmission problems. And, I can't worry about whether it has any impact on gas mileage....sure, I'd love better gas mileage, but when towing, what will be will be.

For what it's worth, I subscribe to the 20% rule as it applies to tow weight. At 6,500 lbs or less, my trailer is ideal for a Tundra. While the Tundra could pull more, I don't think it would be good for the truck over the long haul and 8K+ trailers really tow much better with a 3/4 ton truck (or 1 ton).
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Old 08-28-2015, 11:28 AM   #25
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Using tow/haul

We tow with a 2013 gmc 5.3 w/3.42 rear. 2013 tt is a flagstaff 22' microlite loaded tow weight is around 4500lb. Using tow/haul my tran. Temperature is around 185/200, coolant is in normal range. I do not use tow/haul, tran. Temp. Is around 140 to 160, coolant temp. Normal..no problems towing tt at 60mph.without tow/haul, unless steep hills...
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Old 08-28-2015, 12:18 PM   #26
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From the Silverado Owners manual

Tow/Haul is designed to be most effective when the vehicle and
trailer combined weight is at least 75 percent of the vehicle's Gross

Combined Weight Rating (GCWR).
See
I had the same question when I bought my 2011 Silverado with the same engine. It also states do not use the Tow/Haul when no trailer or light trailer, may damage drivetrain.

HTH,
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Old 08-28-2015, 02:32 PM   #27
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Quote:
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My tow mode prevents the truck from going into the last gear and also makes the shifting more drawn out.

I only use when going up or down hills....
That's the point of using it... it locks out the overdrive and uses more rpm vs rowing through the gearbox. We used to see the "O/D off" button, but most modern vehicles just have the tow/haul mode.

There is another advantage to tow/haul which is more aggressive downshifting to use engine barking to subsidize braking. Especially important on diesels with exhaust brakes.

Don't be afraid of rpm... revs are your friend. And more rpm does not correlate directly to to worse fuel economy. MPG is a function of your right foot.
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Old 08-28-2015, 03:08 PM   #28
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I shift the transmission and turn the T/H and EB on and off depending on terrain and desired ground and engine speeds.
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