2004 4X4 Daully 6 speed.4.10 gear.Top speed 91 mph gross weight 23,000.From my house to Columbus I ony shift to 5th one time on the 470 bypass at Wheeling WV top it at 62mph cross the bridge into Ohio at top speed and it carrys me to the top of the hill at St Clairsville,the rest of the way we hold it at 75 to 80 mph.We have made the trip adveraging 2 hours some times less. I wish We had gotten the 3.73 gears