I'm going to 4.10 because my new parts truck has a perfect set of axles. I rarely go much over 55 or 60 as it is, and I am surrounded by hills and mountains, which driving up the mountains with the 3.08 means wide open in third, or lugging around in fourth. I drove the parts truck around a little before the brake lines blew up(thank goodness in the carport), and the difference on the hills was awesome. It sounds like the switch may be perfect for me.