it's good if you're towing a trailer too (gasp) it allows you to engine brake instead of dragging the brake. But then again, you can do that with any auto tranny now that I think of it...
It also locks out the torque converter at certain rpm's for better throttle response.
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. Itís habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, Iím Nelson, and Iím a drivaholic."