Went to lunch with the wife today. All of a sudden started hearing a loud clicking that had a definite ring to it (like someone hitting a steel tube with mallet) when moving. Noise i in final drive line, as it's only ground speed related, regardless of engine speed or transmisssion gear. Jacked up the front end, grabbed the drive shart from the front diff to the Tx case and twisted. Sounds like something in the case. Anyone got any ideas?