you can run 33s without any lift, I am pretty sure. with 2.5 inches you can run 35s but road only. if you have a 3 inch and 1in BL you can def run 35s, or greater. also, you can run up to 35s stock with the right fenders and few other mods. theres really alot you can do. but you can def run 33s on a very small lift. your gears will be alright with 33s. not great, but alright. most people will tell you you will want to regear. if there is anything I can clear up let me know.