Our trans is a 4L30E...E=electronically controlled.
You must be thinking of that Rambler you had in high school.....
The power mode button on the center console raises the shift points & allows the trans to shift down to a lower gear more quickly than when in "normal" mode.
On the other side of the coin...there IS a cable that controls the throttle body...it's connected to the skinny pedal on the right side of the drivers side foot well...
And PLEASE...don't take anything I've just said personally, (specially tha "Rambler" comment) I'm a known incurable wisenheimer/ninnyhammer...