I have a 4/6 DJM drop. My best 60' is in the 2.3x range on 20" Michelins. With my tonneau cover and shaved tailgate, the rear end hits the notch when I launch it. I'm going back to Gainesville this weekend w/o the tailgate and tonneau and see if it helps my short times any.

 

And, I can't be for sure, but the drop kit AND 20's together seemed to drop my times a couple of tenths. I don't know which one contributed more...the drop or the tires!

 

I just took my 20's off for winter time and it seems like the truck is faster with the stock wheels.