Tow haul button question
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New User
Joined: Mar 2004
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Tow haul button question
I have just recently purchased a 2005 f-250 6.0L Power Stroke. When you push in the tow haul button what is suppose to happen? I 'm not sure its working. Can someone tell me if a light goes on in the dash and does it change the shift pattern in the trans or does it cut out overdrive?
Thanks
Thanks
FTE Leadership Emeritus
Joined: Aug 2007
Posts: 42,085
Likes: 6
From: Lakewood, Ca.
You should have a "Tow/Haul Mode" light on the dash that illuminates when the button is pushed.
On acceleration it raises the shift points higher into the rpm band.
On deceleration it "holds back" and will downshift when you get on the brakes.
On acceleration it raises the shift points higher into the rpm band.
On deceleration it "holds back" and will downshift when you get on the brakes.
Fleet Owner
Joined: Nov 2003
Posts: 27,881
Likes: 3,595
The Tow Haul mode does a few things to help when towing or hauling a heavy load (mostly as Mr. Bricks stated) ...........
1) The shifts occur at higher vehicle speeds (RPM's) for a given acelerator pedal position to improve aceleration, reduce excessive shifting and increase coast braking.
2) Torque converter lock up at lower vehicle speeds for a given acelerator pedal position to improve transmission cooling and efficiency.
3) Upshifts temporarily delayed while decreasing acelerator position during hill cresting to reduce excessive transmission shifting and to prepare for possible grade braking downshift.
4) It increase in line pressure for shifts
5) With tow/haul mode on, you average 100* cooler egt's when you are in the throttle running 3k rpms and 29lbs of boost
1) The shifts occur at higher vehicle speeds (RPM's) for a given acelerator pedal position to improve aceleration, reduce excessive shifting and increase coast braking.
2) Torque converter lock up at lower vehicle speeds for a given acelerator pedal position to improve transmission cooling and efficiency.
3) Upshifts temporarily delayed while decreasing acelerator position during hill cresting to reduce excessive transmission shifting and to prepare for possible grade braking downshift.
4) It increase in line pressure for shifts
5) With tow/haul mode on, you average 100* cooler egt's when you are in the throttle running 3k rpms and 29lbs of boost
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,626
From: SE Florida
No, it does not. It never did. There is no reason to increase line pressure for shifts towing or not. I know all of you think there is, but it isn't needed.
Post Fiend
Joined: Oct 2005
Posts: 10,626
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From: Plano TX and Brentwood TN
I thought line pressure increases were important when you started increasing hp/tq output?
Fleet Owner
Joined: Nov 2003
Posts: 27,881
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I did too. Regardless, I appreciate the clarifications Mark.
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,626
From: SE Florida
The transmission software is calibrated to match the pressure to the engine's output. If at the shift the engine is producing 300 HP it doesn't matter if it is in tow/haul or not. The right pressure for the shift will be there.
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Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
Yes, it is important. Tow/haul doesn't increase horsepower or torque.
The transmission software is calibrated to match the pressure to the engine's output. If at the shift the engine is producing 300 HP it doesn't matter if it is in tow/haul or not. The right pressure for the shift will be there.
The transmission software is calibrated to match the pressure to the engine's output. If at the shift the engine is producing 300 HP it doesn't matter if it is in tow/haul or not. The right pressure for the shift will be there.
I see what your talking about now, your just talking about tow/haul mode period. I gotcha now. Senior moment.
