Hi all, I have a 04 pacifica and the awd is not working. I just replaced the entire reat carrier unit but the awd is still not working. what im confused about is that when I have the car in the air only the front wheels are spinning, the driveshaft is also not spinning but if i put it in netraul and spin the driveshaft by hand all four wheels turn. now is the ptu bad or is something else bad. Please any response would be great. thanks