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Old 09-05-2012, 10:20 PM   #21
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Also on the 05 4l80e the with tow haul on the converter will not lock up under 55.
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Old 09-06-2012, 10:33 AM   #22
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Originally Posted by pappcam View Post
So... are some here trying to believe they're smarter than the engineers and mechanics who built and designed these trucks?

If the manual says to use tow/haul mode when towing or hauling why would you think that it's not the right thing to do?
This is exactly my thought's on this. Turning it off to save, maybe a few bucks, not worth it.

In the Dodge it will still go into O/D, just takes longer to run through the gears. So I'm not even sure you will save anything on a long flat run.
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Old 09-06-2012, 11:05 AM   #23
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i try an follow manufacturers operational advice, but if it is bad for the tranny, oil temp etc to NOT use tow haul, then why does the ford manual, AND onboard DIC state to not use tow/haul on flats for better performance/economy? Im not trying to outsmart anyone here as i am not an engineer for ford, but i was under the impression that following the manufacturers instructions WAS the smart thing to do? Or are you saying that ford is willing to damage the driveline components for the sake of better fuel economy?

for what its worth, there is really no appreciable diff in tranny temp or 6th gear rpm if i use tow/haul with my trailer or not....it sticks at 190 degrees and runs 1500rmp at 65mph in 6th gear either way...all i can really notice is the engine brake and modified shift points under full throttle only with the tow/haul on...

seems to me like if your tow haul keeps the truck out of overdrive then it might be a smart thing to use all the time when towing....but mine does not...i have to manually lock out out 6th if i dont want the truck to use it...otherwise it will shift into 6th, tq converter locked, and will tow all day like that no problems?
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Old 09-06-2012, 01:38 PM   #24
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From the 2011 F-250 manual:

Tow/haul delays upshifts to reduce frequency of transmission shifting.
Tow/haul also provides engine braking in all forward gears when the
transmission is in the D (Overdrive) position; this engine braking will
slow the vehicle and assist the driver in controlling the vehicle when
descending a grade. Depending on driving conditions and load
conditions, the transmission may downshift, slow the vehicle and control
the vehicle speed when descending a hill, without the brake pedal being
pressed. The amount of downshift braking provided will vary based upon
the amount the brake pedal is pressed.
Tow/haul may be automatically activated (without pressing the tow/haul
button). This provides engine braking to assist the vehicles braking
system when going downhill and repetitive braking is sensed. Once the
tow/haul mode has been automatically activated it will not automatically
deactivate.
To deactivate the tow/haul feature and return to normal driving mode,
press the button on the end of the gearshift lever. The tow/haul light will
no longer be illuminated.
Tow/haul will also deactivate when the vehicle is powered down for a few
minutes.
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Old 09-06-2012, 02:30 PM   #25
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My 2012 manual says same thing. But reading that seems to indicate tow haul is to reduce braking effort on hills and to reduce gear hunting...nothing about transmission health?...

This screen in my trucks says more


Click image for larger version

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The entire thing reads 'tow/haul isn't needed on flat ground and deactivating will allow optimum transmission shifting that can result in better fuel economy'....
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Old 09-06-2012, 02:30 PM   #26
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Quote:
Originally Posted by ironj View Post
i try an follow manufacturers operational advice, but if it is bad for the tranny, oil temp etc to NOT use tow haul, then why does the ford manual, AND onboard DIC state to not use tow/haul on flats for better performance/economy? Im not trying to outsmart anyone here as i am not an engineer for ford, but i was under the impression that following the manufacturers instructions WAS the smart thing to do? Or are you saying that ford is willing to damage the driveline components for the sake of better fuel economy?

for what its worth, there is really no appreciable diff in tranny temp or 6th gear rpm if i use tow/haul with my trailer or not....it sticks at 190 degrees and runs 1500rmp at 65mph in 6th gear either way...all i can really notice is the engine brake and modified shift points under full throttle only with the tow/haul on...

seems to me like if your tow haul keeps the truck out of overdrive then it might be a smart thing to use all the time when towing....but mine does not...i have to manually lock out out 6th if i dont want the truck to use it...otherwise it will shift into 6th, tq converter locked, and will tow all day like that no problems?
Where does it say that? Can you somehow post that line out of an online F250 manual?

Here's the tow/haul mode info from my 2011 F150:

Quote:
Tow/haul delays upshifts to reduce frequency of transmission shifting.
Tow/haul also provides engine braking in all forward gears when the
transmission is in the D (Drive) position; this engine braking will slow
the vehicle and assist the driver in controlling the vehicle when
descending a grade. Depending on driving conditions and load
conditions, the transmission may downshift, slow the vehicle and control
the vehicle speed when descending a hill, without the accelerator pedal
being pressed. The amount of downshift braking provided will vary based
upon the amount the brake pedal is pressed.
To deactivate the tow/haul feature and return to normal driving mode,
press the button on the end of the gearshift lever. The TOW HAUL light
will no longer be illuminated. Tow/haul will also deactivate when the
vehicle is powered down.
WARNING: Do not use the tow/haul feature when driving in icy
or slippery conditions as the increased engine braking can cause
the rear wheels to slide and the vehicle to swing around with the
possible loss of vehicle control.
Nothing about "flats" anywhere in there.

Edit: I see you posted a screenshot of the ic. Thanks. I guess only the F250 gets that bit of advice.
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Old 09-06-2012, 02:34 PM   #27
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Quote:
Originally Posted by ironj View Post
Im not trying to outsmart anyone here as i am not an engineer for ford, but i was under the impression that following the manufacturers instructions WAS the smart thing to do? Or are you saying that ford is willing to damage the driveline components for the sake of better fuel economy?
If your referring to my post, 07 Dodge manual says to use "tow/haul mode" when towing... If your Ford book says not to use it on flats, then that's what I would do.

When I started this thread I assumed all manufactures recommended "tow/haul mode" when towing, all the time. Now I know that's not the case. Love this forum, learn something every time I sign in.
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Old 09-06-2012, 03:02 PM   #28
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Quote:
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On my f two fiddy, the tow/haul locks the tq more frequently to keep temps down, optimizes shift points for better pwer delivery, and activates the exhaust brake . With that said, it actually says on my info screen to use tow/haul for hills, and to turn it off on flats for better fuel economy.
Exactly. No exhaust brake on my Eco but it does "brake" more aggressively by downshifting. Also holds gears longer so reduce "hunting". Definitely changes torque converter lockup. If it can't hold 6th gear locked, it will shift to 5th gear locked rather than unlock the TQ and stay in 6th. Heat reduction. Better performance. I always use it when towing.
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Old 09-06-2012, 03:03 PM   #29
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Quote:
Originally Posted by Road-King View Post
If your referring to my post, 07 Dodge manual says to use "tow/haul mode" when towing... If your Ford book says not to use it on flats, then that's what I would do.

When I started this thread I assumed all manufactures recommended "tow/haul mode" when towing, all the time. Now I know that's not the case. Love this forum, learn something every time I sign in.

no..i wasnt referring to you i was just pointing out that i WAS infact trying to NOT be smart and just do what it tells me to do...LOL...so yes..i agree...just do what the manufacturer says...

when i hook up my trailer and go through the info center in the middle of my dash, that is what it says?? maybe its an f250 thing, maybe something new for 2012, or maybe my truck thinks i am an idiot??

in the end, i can attest from my minimaxx sensor readings that neither trans temp or clutch lockup are impacted by weather the button is pressed or not...it may shift a little later, or delay the downshift, but in MY truck it does not disable o/d (as many may do)...it runs through all six gears and wont downshift to 5th unless its a decent hill....?
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Old 09-06-2012, 03:14 PM   #30
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Exactly. No exhaust brake on my Eco but it does "brake" more aggressively by downshifting. Also holds gears longer so reduce "hunting". Definitely changes torque converter lockup. If it can't hold 6th gear locked, it will shift to 5th gear locked rather than unlock the TQ and stay in 6th. Heat reduction. Better performance. I always use it when towing.

see, mine will only run in 6th unlocked if i am NOT towing....if i got the trailer on, it always goes from 6th locked, to 5th locked??..tow haul or not...maybe because the trailer is heavy (~9200lbs trailer ~17200 gcwr)??..i do notice all the other stuff tho...delayed up and down shift, exhaust brake etc...
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