It changes the shift points of the transmission. When accelerating or decelerating, it will shift at a higher speed that normal. This will give better performance in hilly terrain, but will sacrifice fuel economy. In flat areas, you might just as well leave it off.
Joel
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Retired electronics engineer. Avid paddler & birder.
2011 Silverado 2500HD, diesel, 4x4,crew cab, 8' bed
Palomino Puma 253FBS (27' 5er) & '94 19' Class B
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