a 4" and 35"s looks nice and is a really common set up. that's why i went with a 4" and 36"s to be different. lol! but a 6" and 35"s looks good too. however a 6" usually means new drive shafts and steering stuff. of course even the 4" requires a steering arm, that's usually included in the kit. if i were you i'd go with a 6" and 35-37s. you get a 4" now and you'll want a 6" later, i did and i do.