This one is pretty self explanatory. I know that different axles take different methods and such, but I think an overall guide would be very helpful to a lot of people. Around here it would be $300+ per differential to have new gears set up. With a quality set of gears costing as much as they do plus an install kit, regearing can become quite an investment. Just a thought, if done thoroughly and correctly it could save a lot of people a lot of money.