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Old 12-11-2016, 08:39 AM   #15
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here is a excerpt from a book on the subject

got this excerpt from the below PDF. So even when in Tow Haul Mode it will still shift into OD when engine is not under load and speed is around 50 or 60 MPH. I use mine when climbing hills and mountain passes and when going down hill. I also use it whenever I go through towns and traffic, especially when towing my toad.

Here’s a run down on Ford’s “Tow/Haul” mode when engaged:
• Raises the shift point RPMs and internal trans shift pressures for a given
engine load
ƒ Maintains the ability to engage overdrive gear, but eliminates
the possibility of engine lugging
ƒ Controls shifting frequency to avoid shift hunting and
unnecessary torque converter cycling
• Engages the “coast clutch” and uses other internal trans clutch/band
application strategies in order to achieve engine braking through all gears as
the transmission coasts down.

Tech Tip - August 06.pdf
Downsized to a 1995 Layton Travel Trailer by Skyline. restore project see it and the mods in link below.
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Old 12-11-2016, 09:11 AM   #16
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Originally Posted by marjoa View Post
I just want to make sure I'm not putting any unnecessary stress on my MH's drive train so I want to just run this by you guys to see if these driving habits are ok.

1) So say driving on the freeway and then exiting on a ramp I would anticipate I need to be slowing down soon so I let off the gas 1st, coast a bit and then hit the tow mode button as I apply a little braking and the engine will down shift, 4, 3, 2, 1 assisting me to a total stop so I'm not using all brakes.

2) Driving in town to the storage garage, or going through a small town or whatever. You're in typical town traffic running in "Drive" 25, 35, 40 MPH and then you see a light turn red ahead. Again, let off gas, coast a bit, hit tow mode and let the engine/tranny downshifting do most of the work to slow you down. Once at a complete stop, hit the tow mode to off position, and then start moving again in "Drive".

Is using the Tow mode to assist in braking in these type of situations as a daily driving practice "a good practice"? Does it pose any hard labor or unfriendly functions of the engine/tranny?
I have always used my Pacbrake much the same as you use your Tow mode, (and have for over 150,000 miles).

The original disc brake pads on my 1996 Safari Sahara lasted 19 years, (144,500 miles).....with NO "hard labor" or "unfriendly functions" of either the Cat diesel engine or the Allison transmission.
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Old 12-11-2016, 09:38 AM   #17
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Seems to me like to OP is using his gasser the correct way. You aren't harming the trans by using it as designed and saving wear and tear on your brakes.

As a side note, you will receive more relevant answers from the Ford Chassis forum:

iRV2 Ford Motorhome Chassis Forum
I don't make it much on here anymore so will not see your reply to my comment. Drop me a direct message and when I come back on I will see it.
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Old 12-11-2016, 10:25 AM   #18
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I use tow-haul mode in traffic as well...especially when towing the car. The extra control when stopping is helpful and the transmission is certainly designed for this. Additionally, hot brakes can fade and I think that using T/H mode certainly can reduce the wear on the brakes so you'll have them when you need them. A good following distance, moderate acceleration and anticipating stopping and slowing certainly helps both the brakes and tranny do their jobs.

Finally, most of us would not be considered high mileage users of our rigs, so transmission wear would really be difficult to accrue at such a level that using tow/haul would be a factor in causing components to fail from high usage.

Enjoy your rig!
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Old 12-11-2016, 02:05 PM   #19
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Originally Posted by computerguy View Post
Seems to me like to OP is using his gasser the correct way. You aren't harming the trans by using it as designed and saving wear and tear on your brakes.

As a side note, you will receive more relevant answers from the Ford Chassis forum:

iRV2 Ford Motorhome Chassis Forum
Yep a gasser and thanks for the feed back everyone. Also that attachment from mhbell very helpful too.

Yes computerguy that's exactly what I was trying to do is save wear and tear on the brakes but just wanted to make sure I wasn't compromising the tranny/drive train components.

Well good, I'm going to continue this braking assist procedure to slow down and keep from using all brakes.

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Old 12-11-2016, 03:44 PM   #20
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The Tow/Haul function is a whole different thing in the Dodge than in the Ford.
2005 Newmar Kountry Star Gas 3742, Workhorse W24, 8.1L/Allison 5-spd
2017 Grand Cherokee or 2017 Harley Ultra in tow
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Old 12-11-2016, 03:59 PM   #21
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Use as designed, that's what's it for. Never had a problem with the Allison trannies 300,000 miles plus. Don't know about dodge or ford. Brakes are cheap but you can overheat them and cause brake fade and not have them.
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Old 12-12-2016, 06:40 AM   #22
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Originally Posted by twinboat View Post

If you read your owners manual, you will see that it is OK to use it whenever it seems to help control.

There is no "Coast Clutch". The Mode simply reprograms the shift points, to a little sooner or latter, that funtion all of the time while driving, in the transmission.
Twin boat,
In the torqueshift "5"speed trans it has a Coast clutch which supplies engine braking for deceleration. In the torqueshift "6" there is not a Coast clutch rather this trans uses the low one way for engine braking with exceptions of first and reverse gear. Use of tow haul will not damage any components as you stated. Let me clarify my poorly written post. I would just turn on tow/haul after every start to achieve the desired braking addition original poster is desiring. The constant on/off will create issues in the switch and adds to more driver distraction so why not just turn it on and leave it on startup?
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Old 12-12-2016, 07:15 AM   #23
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Just keep it simple. Start engine, press Tow/Haul, toad or no toad.
Tom Wilds

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2015 Jeep Wrangler 2DR 4WD Sahara, Automatic, Hard Top
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Old 12-12-2016, 09:15 AM   #24
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My PacBrake exhaust brake stays on all the time. It does not activate until I depress the brake pedal.

If I'm on a freeway and NOT in heavy traffic, I start giving a turn signal and take my foot off the throttle when approaching the exit. Depending on the length of the exit ramp I either let it coast or depress the brake pedal momentarily to engage the exhaust brake and apply the brakes as needed with the exhaust brake doing most of the work.

In city traffic, I maintain a LOT of space between me and the vehicle ahead and try to let the exhaust brake do most of the slowing down.
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
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Old 12-13-2016, 08:22 AM   #25
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I'm not familure with Tow/Haul mode on the allison but I am Grade Brake.

It activates when needed and deactivates when not needed.. So for Grade Brake

Normal driving: Transmission ignores the switch
Braking: Transmission will "DOWNSHIFT" if engine speed allows to assist in braking. It will upshift if engine speed becomes too high.
Accelerating: Grade brake functions disengage soon as you touch the accelerator and transmission operates normally.

NO NEED to touch the switch.

OVERDRIVE: if transmission is shifting frequently in and out of overdrive turn it off, If transmission finds a gear it likes and stays there. Leave it on.
Home is where I park it!
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Old 12-13-2016, 09:01 AM   #26
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I always used tow/haul in our gasser.
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