Derate for automatic Cascadia solution?

If it’s a DT12 transmission it should work just unplugging the speed sensor.
If it is a Allison it will up shift, but it won’t down shift and you’ll need a transmission.

 

Yes, I don’t remember the year model, but it was in the neighborhood.
It was to get to a safe place to work on it 6-7 miles.
Turn the truck off and get out of the truck,let all the modules close, then unplug the speed sensor.
You’ll know if it works when you start to take off all the lights should go out.

 

I know. I'm a dinosaur. My best advice? Throw the autoshift in the scrapyard and put in a manual 13 speed. In the long run, you'll save money.

 

+1 this. 2022 winter I got derate at a far-away town in Northern BC. Unplugged the speed sensor and drove 700miles with no big issue other than capped 1000rpm and no engine brake.