That just seems horrible for that combo. One good thing is there is definately room for improvement! That is a really tall tire for that gear and e.t. I have cheapo shocks and stock leafs and I run 1.48 to 1.49 60'. My guess is a lot of its your converter. I run a coan 8" and it is suprisingly tight on the street and flashes aroud 5000-5200.