When I went to change the diff fluid in my crewcab's 14 bolt, I discovered this little present. All of the rollers from the third pinion bearing were on the bottom of the diff, along with various pieces of the bearing cage. The truck drives perfectly and its probably been like this since I've had it (~10k miles) but it pissed me off. Now it has to go to a gear shop to get fixed and cost me money. This is actually the second time I've seen this happen. I parted out a 14 bolt and it had the same exact problem, from the same bearing.