I am trying to understand the whole rear gear concept. I think I have pretty good idea, but maybe some of y'all can clear a quesiton up for me. I have a '08 Silverado with 3.42's and my stock wheel size is 265 70 R17. My buddy has s '10 Silverado with 3.42's and his stock tires are 245 70 R17. I have read if I go to a 285 70 R17 that would be like having 3.23's. So to get to my question; if my tires from the factory are 265's and my buddy's are 245's was my gearing a bit lower (higher number) from the factory or am I really more like 3.30's. I am hoping this is not a noob question, but I just can't wrap my little brain around it. Thanks!