lift kits trailblazer

i have a 2003 ext and i just got 265/65r17 put on and i don't know if i should do the markmc 2.5 or 3 in lift?! I'm having trouble finding pic and threads to solve my problem. if you have ideas or pics please post :) thanks

Hello, I have a 02 Chevy Trailblazer LS 4.2L Engine with RWD. I wanna put this lift kit on it...