Using the "M" on the Allison Transmission - Chevy and GMC Duramax Diesel Forum
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Old 05-18-2008, 01:36 PM   eBay Motors  #1 (permalink)
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Using the "M" on the Allison Transmission

Ok, I am new to the diesel truck and the Allison Transmission. I see that the M is used when pulling a trailer. My question is When is the most appropriate time to use this feature. I will be going to Colorado in June and will be crossing over Cinnamon Pass that drops into Lake City. I have been told by most folks that once you go down this pass you will not want to go down it again. I am thinking that this is purpose for this feature. I can use all the help I can get concerning towing my 5th wheel through the mountains and how this feature can help.

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Old 05-18-2008, 01:39 PM   eBay Motors  #2 (permalink)
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Most of the time Tow/Haul mode will do everything that you want it to do with the grade braking feature. If you wanting to put it in M mode to hold a gear longer then it wouldn't hurt a thing. The allison is a very smart tranny and will take care of itself, if you put it in M4 it won't let it over rev it will shift to 5 before it hurts anything, so i would say put it in tow/haul and take it easy at the top.

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Old 05-19-2008, 07:12 AM   eBay Motors  #3 (permalink)
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M - is for manual

I tow a 5 th , and personally I dont find too many times that I need the manual control or the tow-haul mode .
Going through the mountains here in British Columbia , I will use the tow-haul mode when going up a very steep grade for some distance or use it when going down a steep grade where brakes alone may heat up.
You will love the Allison trany , its the only auto to have in a tow vehicle . ( or stay with a standard )
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Old 05-19-2008, 07:28 AM   eBay Motors  #4 (permalink)
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I tow a large trailer most of the week and I have never had to use M. Tow/Haul mode takes care of everything. Good Luck and Welcome.
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Old 05-19-2008, 07:36 AM   eBay Motors  #5 (permalink)
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I was towing in "M" mode this past weekend...I used this mode in windy hilly roads where I knew my speed would be changing quite often...In my situation I felt there was no reason for my tranny to shift into 5th or 6th gear during this time because before I knew it I was decellerating down to 2nd gear so I set it in "M" 4...This just prevents it from shifting between gears so much which I think is easier on the tranny
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Old 05-19-2008, 10:57 AM   eBay Motors  #6 (permalink)
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the only time i used M mode is when i was running heavy roughly 25,000-30,000 pounds gross weight so on the hills i put it in M mode and shifted to 5TH gear to keep my EGT's down since i was running aftermarket HP.
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Old 05-21-2008, 12:31 PM   eBay Motors  #7 (permalink)
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Even though I have only towed my TT once, I used the M when I was decending a steep winding grade on a mountain road that I didn't want to get over 20 mph on. Otherwise, I just used T/H on the main roads. It works great!
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Old 05-28-2008, 08:29 AM   eBay Motors  #8 (permalink)
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I live in Colorado and tow my 5th wheel in the mountains allot. I've found the T/H works great 90% of the time, automatically down shifting and applying the engine break on the down hill side of the passes. I use the M mode on the steeper, windyer roads that I feel I need more control on. I've descended many long steep grades by toggling up and down through the gears without having to use my brakes. It makes for a safe and comfortable decent.
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Old 05-31-2008, 01:53 PM   eBay Motors  #9 (permalink)
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