well i was screwing around today trying to figure out what the hell that banging noise is i hear when its in 4 wheel. i was driving and a kept hearing the noise and then a little pop. so then i put it in 2 wheel and drove home. now the hole way home there is this vibration i can feel though the wheel. anyone tell me what the hell it was. could i have broken a u joint in the front. i know mine are shot anyway. it happend right when i was messing around with my CAD.