Holy Cow! What a great modification! Makes me ALMOST want to run right out and get a new truck! Then I think of the payments and....
But, it's clearly NOT the same thing as the overdrive button. That only locked out 4th gear. As far as I can tell, nothing else changed.
They could have easily set the A/F ratio a bit richer too, as long as they stayed within EPA guidelines.
And, shotgun, super research! Good on you!
- Jack