Our 2016 SS developed a rather annoying grinding sound at about 800 miles, when the clutch is depressed while decelerating. Sounds identical to a pilot or throughout bearing going bad, except it is emanating from right angle drive. I changed differential oil with Mobile 1 and put SS on blocks with engine running at about 2000 RPM. as soon as drive line is unloaded or the clutch is depressed, right angle drive makes this sound. Dealer agrees with noise being abnormal, but could not compare to another SS. Dealer contacted factory, which won't do anything, say's sound might be normal. I contacted them and got a big run around. Worst customer warranty service I have ever experienced. I am convinced this is a problem. Both dealer and factory tell me that they can look at it, but if it is normal I would have to pay the bill. My concern is that the dealer does not have a clue. He did not even know there was a Zerk fitting on the U-joint. Anyone with similar problems?