First post here...I have an 02 Limited with the 4.7 and quadradrive. Four wheel drive is not working in full time, so I'm thinking the coupler is gone. There is also some vibration and slight noise coming from the front end. I jacked the passenger side up off the ground and the tire/wheel spins. Its making some noise in there as well like bearing or gears or something. Question is, being full time 4wd, shouldn't the front not spin if the jeep is in park and the other three tires are on the ground? I'm just trying to figure out what to look for when I get into it. Thanks guys!