gears?
 

i have a 99 v6 auto and i plan on putting a 9 psi procharger on my car i was wondering what gears i should go with and was wondering about how much horse i would have because its says 7 psi is 290 hp and 11 psi is 345 hp?

Usually everyone says go with 3.73s when riding with a supercharger. What psi were you thinking of running?

I'm a firm believer of 4.10's in our auto's. but with a supercharger if you really want less gear go with a nice 3.90 set-uop. A nice biddle ground between 4.10's and 3.73's. And I never understood why you wouldn't want your supercharger making boost as much as possible? Prochargers don't start creating boost after 3k so 4.10's wouldn't be bad at all with a good tune and tranny shift point adjustments. but hey 3.90's would be nice too.