Allison 2500 economy mode

[awol50]

Is the tranny in economy mode when the red light is on or off? No matter what mode it is in, when I turn the ignition off, then on it defaults to red light off.
My guess is the default is not economy mode, red light off.

[BFlinn181]

Here's the manual for the Allison 2000 series, it suggests the red light is a malfunction indicator, I think. There are a number of gear selector styles available for the AT 2500, from shift levers to button pads. I suggest you read this manual to figure out what the light means.

[YC1]

On my 3000 it is in economy mode with the light on and I do have to turn it on after starting the engine.

I can tell a big difference in the acceleration with it off. It winds up a bit more before shifting. I have it off most of the time. On the freeway is the only time it is used for me.