I have a low mileage '03 (37600). Last spring, the squeek/start shudder I had from the center/rear of the truck went away. It was replaced by a hopping. The center u-joint on the rear drive shaft seized. After messing around with various joints from several sources, I took all the parts to the local Fleet Pride shop. They found a set of Spicer joints that fit and can be lubed. Set me back about $120, parts and labor for three joints. The joints that came out were totally dry. The one that seized really didn't have any rollers left. If you have the original u-joints, listen close. Four winters of salt killed mine, not the mileage.