Just bought a 2013 JK Sport frame/tub and have started collecting parts for my project: a 3.5" lifted One Ton Axle critter. Since I literally have no axles, suspension or drive train can anyone recommend a good spring length and shock to put on it and run 37s? I doubt I'll ever put 40s on it, but maybe there's a specific recommendation that would also make it 40 ready.