Great information guys. Tomarrow I'm going to order up a programmer to at least recalibrate the speedo for my larger tires. Everywhere I have read has said recalibrate go will make a significant difference itself, so I'm going to start here. I'm going to re-gear, and will be purchasing gears next week, but like everyone else i want to do as much homework as possible. I plan on running the 5.13, in an overhaul kit. Sounds like we will be doing the install ourselves at my fathers shop. Very excited? Currently looking into 4ws.com 5.13 overhaul kit, does anyone have any comments or concerns with this kit? Or even recommendation of a good company that you may have purchased your own through? Also I'm currently looking into the flashcal, and the procal. One better than the other, or recommendations on another tuner?