Difference between "Normal" and "Tow and Haul"

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miran

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Could someone please explain to me what changes on the truck when the "Tow and Haul" mode is turned on. I can feel no difference when towing a trailer and turning "Tow and Haul" option on or off.
Thank you!¨
Miran
 
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miran

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Hmm .. thanks!
But as mentioned: i've played with that T&H switch while towing more than 2000 kilograms trailer - no change in gears, no change in revs. Nothing. Does it maybe affect traction control or something else? Or should I press that switch before driving off?
Mine is 8 speed gearbox.
Miran
 

ExpressRules

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It locks out your top gear so your rev's stay in a better range for towing a load.
 

Grown in Tx.

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It takes away the o/d and increases rpm like mentioned before. I think it might change some shift points in the trany as well. If you don't notice a change you might have a bad button or something, because you should definitely feel/hear a change.
 
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miran

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I did some "test" today: driving up very, very steep hill and there is really some difference: with T&H disabled - it shifted at 2500 rpm while with T&H enabled it shifted at 3000 rpm (I guess it was from second to third).
Any difference in traction control or similar?
Miran
 

Andy578

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with the 8 speed it really just runs higher rpm, spreads the gears out more and will down shift faster to give more engine braking. it will still use all 8 gears and MDS will still activate if the conditions are right
 

skHemi64

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To note on the link provided above...

"Use of ERS (or TOW/HAUL mode) also enables an
additional underdrive gear which is not normally used
during through-gear accelerations. This additional gear
can improve vehicle performance and cooling capability
when towing a trailer on certain grades. In ERS mode,
gears 1 though 3 are underdrive gears, and ERS 4 is direct
drive. ERS 5 and 6 (Overdrive gears) are the same as the
normal fourth and fifth gears. NOTE: TOW/HAUL mode locks out Overdrive."

That said, I typically don't use Tow/Haul mode. Some stretches I can keep 6th just fine with my horse trailer. I will manually shift down to 5th for uphills, but also allow the rig to slow down some to avoid downshifting to 4th if possible. Although, might be a good idea to use Tow/Haul if you are in under-55 mph stop and go traffic, just to keep the rig moving smoothly.
 

clh1220

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To note on the link provided above...

"Use of ERS (or TOW/HAUL mode) also enables an
additional underdrive gear which is not normally used
during through-gear accelerations. This additional gear
can improve vehicle performance and cooling capability
when towing a trailer on certain grades. In ERS mode,
gears 1 though 3 are underdrive gears, and ERS 4 is direct
drive. ERS 5 and 6 (Overdrive gears) are the same as the
normal fourth and fifth gears. NOTE: TOW/HAUL mode locks out Overdrive."

That said, I typically don't use Tow/Haul mode. Some stretches I can keep 6th just fine with my horse trailer. I will manually shift down to 5th for uphills, but also allow the rig to slow down some to avoid downshifting to 4th if possible. Although, might be a good idea to use Tow/Haul if you are in under-55 mph stop and go traffic, just to keep the rig moving smoothly.

He doesn't have your transmission. Totally different.
 

Valhakar

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I can tell you from my butt-dyno testing that the Aisin tow/haul is EPIC. Without a load I can accelerate to 50 mph, let off the gas, and it downshift aggressively and uses engine brake. Enough to send you into your belts. Turn T/H off and it just coasts gently down the road.
 

SouthernBoy

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I LOVE the Tow/Haul mode on my new 6.4 - it shifts exactly where I want it to when towing and doesnt downshift too early either. My older 2009 6.7 sucked with Tow/Haul turned on, the downshifts alone would throw you into the dashboard.
 

reindeerman

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I LOVE the Tow/Haul mode on my new 6.4 - it shifts exactly where I want it to when towing and doesnt downshift too early either. My older 2009 6.7 sucked with Tow/Haul turned on, the downshifts alone would throw you into the dashboard.

I have a 2011 4.7. Love the tow mode. The downshifts are spot on and aggressive for engine braking. Since I tow 95% of the time it is great feature. My 3rd generation doesn't do this.
 
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