Mitch, there isn't anything that really has to be done first. Do it as you can. But I can say that your 3.55 or 3.07 gears are too tall for 35s. If you reagear you will eventually make it up in gas milage. As to lift, 6.5" is as tall as you can go without steering modifications. You should plan on a slip yoke eliminator to go with the lift. You will have driveline problems if you don't. As far as the front axles goes, heavier axles depend on whether or not you put a locker in it or type of terrain you wheel and some driving style thrown in