Originally Posted by definn12
There is something built into the BCM called passing assistance.
Interesting. I wish it were an optional setting. The EcoDiesel typically has quite a bit of power it can deliver without downshifting. Dropping into 7th and punching it really does cause a significant surge. When I'm driving on the interstate with ACC and I decide to pull around I'd typically rather pass at a moderate pace rather than having it power up it and push me back into my seat. If I've been behind a slow-moving tractor-trailer then I have seen it drop all the way to 5th.
On stock this can be tamed by using the paddle shifters and locking the tranny in 8th. From what I understand, the GDE Hot Tune will cause the system to downshift regardless—even in manual mode (and in manual mode it won't automatically shift back into 8th).