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Posted 02 October 2012 - 08:58 PM
Can someone explain what exactly it does and how I should make use of it?
Also, if I press it, is there some indicator light that should come on that will let me know it is "ON" so I can turn it off when finished using it?
In other words, I would not want it to be in a state that I cannot tell if it is on or off.
Posted 02 October 2012 - 11:34 PM
There should be a small light, probably on the shift lever, indicating the Tow Haul feature is engaged. Are you sure it isn't there somewhere? Also, each time you shut down and restart the engine, the Tow Haul feature should reset to "off" for regular driving. With that in mind, you will probably need to turn it on each time you start with the load attached.
Please, please check your owners manual to confirm, since my vehicle is not the same as yours. However, you should find that your TowHaul operates similarly.
40' Monaco Dynasty
Orange County, California
Posted 03 October 2012 - 05:49 AM
So if I am not towing anything, it sounds like the only real use I would have would be to engage it for very steep downgrades, to provide a sort of "engine brake" effect. Does that sound about right.
The MH weighs a bit under 12,000 lbs loaded and I do not tow a vehicle.
Posted 03 October 2012 - 10:47 AM
With it engaged, the transmission allows for more engine braking.
In overdrive when you reduce the throttle, coasting resistance is reduced.
Posted 03 October 2012 - 11:41 PM
40' Monaco Dynasty
Orange County, California
Posted 04 October 2012 - 06:47 AM
Some people said you should use it all the time, while others said only when you "notice you need it".
Some people thought it would improve gas mileage (less torque convertor slippage), while others said it would lower overall gas mileage if used all the time, (engine RPM would average out much higher, more gas).
I will say that on our trip out to the Grand Canyon, including "mountainess regions" across NM and in AZ, on my MH I did not use it, (I never have used it so far), my MH seemed to handle things well. On uphills it would jump up about an additional 1000 rpm to get us up hills.
And on at least 2 steep downgrades it seemed to adjust without applying brakes, to help keep the speed from running away. I could feel the transmission "change" and the engine noise change and it kept speed under control. This was all on Cruise Control, without the T/H engaged.
So I don't know the best way to make use of T/H. Other than I might try it on an future steep downgrades to see how it differs.
Posted 04 October 2012 - 09:55 AM
Posted 05 October 2012 - 08:55 PM
Posted 05 October 2012 - 09:50 PM
Posted 02 November 2012 - 10:37 AM
With TorqShift® transmission, select Tow/Haul Mode to automatically eliminate unwanted gear search when going uphill and help control vehicle speed when going downhill.
I use it when in the mountains.. Saves the brakes...
Posted 03 November 2012 - 11:47 AM
Allison 3000MH tran.
Towing a Honda Civic on a Acmey tow dolley.
Posted 04 November 2012 - 12:58 PM
Posted 07 November 2012 - 09:31 AM
Posted 09 December 2012 - 07:15 PM
Posted 23 August 2013 - 09:35 PM
Thought I would try to answer the question of the Tow / Haul button for the Chev and Workhorse chassis from the service information on hand.
The Owners manuals for the different chassis manufactures will spell out the operational change of the unit when one engages the button.
The specifications for the drive-trains using the 4L80 or the Allison 1000 series transmissions and what happens internally are a little different.
4L80E series transmission Tow/Haul Mode, Displays Yes or No. This parameter indicates when the transmission is operating in the tow / haul mode. In the tow / haul mode, the PCM commands a different shift pattern that increases performance when towing or hauling. Shift quality and TCC scheduling are also affected during the Tow/Haul mode of operation. One will also notice that this transmission has a tendency to whine, do to the setup used in the planetary gears.
The Allison transmission Tow / Haul mode Displays active/ inactive; This parameter indicates whether the driver has placed the vehicle in the Tow/Haul mode. When this parameter is active, the TCM modifies its shift strategy in order to provide more torque to the wheels during shifting.
The buttons do the same thing, but different modules are involved.
The Chassis manufactures of the P Series Chassis and the Workhorse do spec different transmissions when using the same engine like the 8.1 L GM series.
The Ford RV Chassis using the V10 engine has a Tow / Haul setup from what I understand and most likely works in much the same way, changing the shift pattern and the way the TCC responds to the different switch setting.
Everything regarding the change is controlled by software commands in modules.
PCM = Power Train Control Module and it is Electrostatic sensitive !!!!
TCC = Torque Convertor Control
TCM= Transmission Control Module
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