You need to see what gear ratio you have. Most likely you have 3.07 but do a search and you will find a lot of threads on how to determine that. I currently run 32's with 3.07 gearing and it is not ideal but it works. I live in Idaho and do a lot of flat highway driving so that makes it bearable for me.
"The problem with arguing with an idiot is others can't tell which one the idiot is"