Truck was driving rougher than normal but I didn't think too much about until something popped/snapped. I pulled over and the front driveshaft is connected to the front differential but loose from the transfer case. I'm not too savvy on the drive train but I had been reading up on replacing the u-joints. Does a u-joint connect the driveshaft to the transfer case? And what fluid would I be leaking? I've got a tow truck on the way with a little time to kill.