Forget the chart. It doesn't take into account weight from mods, gear, mountains, or wind. It doesn't tell you you will be in third gear screaming above 5500 rpms to do 70 up a steep grade or the the amount of downshifting it will do. Nor does it mention how high your temps will rise due to running at those rpms. I've had 3.73, 4.88 (because of the chart) and 5.38 on 37's. I've driven 5.13's which was nice and still would choose 5.38's but it's not my daily driver. You will drop down one gear on steep climbs versus two and I liked it for crawling.