I've gone 2.1, but averaged 2.2 the last time I was at the track. 4.3 5speed, 3.23 w/G80, stock bald 245/70s. Launching at 3500 and slipping the clutch. My truck has changed a good bit since I've been to the track, so I have no idea what it'll do now. The NV3500 has a very low 1st gear, so if it hooks, it up and goes alright.