how much lift to run 40's? minimum.?

[HGW]

No, you do not need a supercharger BUT you will need a new set of front and rear gears unless you want the stock sluggish beast to be even more sluggish, especially in mid reange like when trying to pass someone on the highway.

4.56's front and rear will do the trick--the H2 will perform about the same as with 35's and the stock 4.10 gears. (the weight of the new tires and wheel will slow it down a fraction) Anything you add for performance will make it run even better.