My new rig has a 203, and i'm lost on the whole concept of HI-LOC, HI, N, LOW, LOW-LOC. Can someone please explain this to me? The truck currently has manual hubs, and this confuses me too for some reason. Now if I don't like what you guys tell me about my 203, how hard would swapping a 208 or 205 in be? Would Driveshafts have to be modified?