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Old 05-16-2015, 12:25 PM   #1
42x
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Allison trans

What does the mode button do on the trans? Is it like overdrive?
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Old 05-16-2015, 12:33 PM   #2
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What does the mode button do on the trans? Is it like overdrive?

No such luck. The chassis builder can tell you for sure on your coach. Normally, when the mode button is pushed the light is on, the shift schedule is altered so that an up shift will occur a couple of hundred rpm earlier. When pulling hard on a grade, the transmission will hold a gear longer and the rpm will drop lower and closer to torque peak before down shifting. This is somewhat effective in moderate rolling hills but has no effect in flat land driving.


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Old 05-16-2015, 02:03 PM   #3
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Mine says economy mode and mirrors what Steve said on the shift points. I never really did look closely to see when it shifts and if it does affect my mpg, one can only hope.
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Old 05-16-2015, 04:49 PM   #4
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Ours ius economy mode. And it does improve our mpg. It actually also makes a difference in the shift pattern on rolling hills and grades
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Old 05-16-2015, 05:06 PM   #5
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What does the mode button do on the trans? Is it like overdrive?
I see you're new to us! How long have you been RVing?

The mode button is an economy mode switch. I keep mine in this mode when I am not pulling grades. When in the mountains I shut it off to increase power and to get better shift points. It will drop the RPM/power when you don't need it, thus saving you a bit of fuel. In the mountains you need all the pulling power available. I frequently manually downshift in these conditions and keep the RPM around 2000 to 2500 range. On a 6%+ grade I may go as slow as 35 to 40 MPH. The mode option is counter productive in these conditions. Shifting comes in too late and forward speed is gone.

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Old 05-17-2015, 10:18 AM   #6
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Yes, we are new. We are second owners of 01 National tradewinds . This our first rig leaning. Thx for your reply, it is very helpful.


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Old 05-17-2015, 05:05 PM   #7
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Allison transmissions have two personalities

normal and other

What that OTHER is depends on the programmer

Normal/Economy
Normal/Grade Brake
Normal/Tow-Haul

And so on.
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Old 05-17-2015, 05:21 PM   #8
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What does the mode button do on the trans? Is it like overdrive?

Welcome to iRV2.
If you go to the " Files " drop box in the blue bar , under your welcome message, in the Chassis section you can pull up and download a users manual for your transmission.

Also, if you hit the " Quick Links " drop box, in the same blue bar, and then the " Edit Signature " you can type in your coaches info and click save at the bottom of the page, and you coach info will automatically appear below your posts, as mine does below this one , and you won't have to type it in every time you ask a question.



EDIT: and I see somewhere between post #1 and #6 you figured that out.
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