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Open Roads Forum  >  Tow Vehicles

 > Tow/Haul mode question

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Mountain Mama

N. TX

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Posted: 02/27/12 07:26am Link  |  Print  |  Notify Moderator

More times than not when we're pulling the 5vr, we forget to set the Tow/Haul button so we try to find a place to pull over before we set it. Can we set it while moving, or are we doing right by stopping before we set it? Owner's manuel doesn't specify.


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Ranger Smith

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Posted: 02/27/12 07:28am Link  |  Print  |  Notify Moderator

Yes you can set it "on the fly" don't need to be stopped to change the mode


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Posted: 02/27/12 07:28am Link  |  Print  |  Notify Moderator

You can engage it whilst moving.

crickeydog

Marietta, Ga.

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Posted: 02/27/12 07:45am Link  |  Print  |  Notify Moderator

Yes you can shift into/out of tow/haul while moving. Our spedcific Allison 6 speed auto is upgraded with a Suncoast triple disc performance TQ converter, upgraded input/output shafts, performance shift kit & upgraded valvebody, an Allison oversized tranny fluid pan, and an Eaton "E" Locker 3.73 rear differential. Our engine has a Predator tuner set to performance mode. Dyno analysis indicates our truck produces peak torque of 725 FT LBS of TQ at the rear wheels from 1100 RPM thru 2800 rpm.

My towing preference is to select "M" manual mode and use tow/haul from a standing start through 4th gear low (TQ converter locked up) Then I switch tow haul off so the tranny will shift into 5th & 6th gear sooner (TQ converter locked out, engine & tranny in direct) when I manually upshift as speed and engine RPM dictate. I cruise on the flats or low rolling terrain at 60 MPH in 6th gear over (TQ Converter locked out not in tow/haul/ & the engine turning about 1650 RPM. We generally average a solid 12.5 MPG when towing our 14K+ 5'er with MPG's occasionally as high as 14 MPG with a tailwind and manually calculated. On a long shallow grade I'll drop down a gear to 5th over and set the throttle manually with my foot while climbing still in the 1700 RPM range or bgelow then back to 6th over when I crest the hill. When I have to stop, I select tow/haul mode again to use the Allison braking feature. If I climb a grade that's steep enough and long enough to drop 2 gears or more, I reselect tow/haul to engage the TQ converter, manually set the throttle with my foot, and then select the best gear under according to the engine RPM's. Very verey rarely do I ever allow the engine above 2000 RPM's in any gear at any speed. Just my way of towing. Tranny temps hover around 170 degrees & coolant temp around 208 degrees year round.

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Gale Hawkins

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Posted: 02/27/12 07:56am Link  |  Print  |  Notify Moderator

Contains some manual info.

skipnchar

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Posted: 02/27/12 08:00am Link  |  Print  |  Notify Moderator

You don't need to pull over to push the button. For that matter you don't need to push it at all unless your transmission is running too hot. You will get better fuel economy if you leave it off. All it does is change the shift points on your transmission so it stays in lower gears longer before shifting.


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Kip81

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Posted: 02/27/12 08:41am Link  |  Print  |  Notify Moderator

skipnchar wrote:

You don't need to pull over to push the button. For that matter you don't need to push it at all unless your transmission is running too hot. You will get better fuel economy if you leave it off. All it does is change the shift points on your transmission so it stays in lower gears longer before shifting.


Not true. On the Allison your torque converter only lock in 5th gear and 6th on the 6 speeds, But when tow/haul set it locks and second. Most newer trucks it changes shift points and lock up.

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Posted: 02/27/12 08:48am Link  |  Print  |  Notify Moderator

I use TH near cites or in the hills and mountains or when I need to slow down (as when exiting a freeway). On flat ground I leave it off.
I also use cruise on flat ground but not in hills or mountains.
I travel at 65mph in high gear most of the ride.


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Posted: 02/27/12 09:16am Link  |  Print  |  Notify Moderator

Hows that exhaust brake working for you?


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Posted: 02/27/12 10:28am Link  |  Print  |  Notify Moderator

Tow/Haul should have no effect when on flat ground, the benefit of tow/haul is the changing of shift points when accelerating and the engine braking on downhills. If your engine doesn't shift on the flat, tow/haul doesn't have any effect.


John A. Lichty

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