I have noticed more times than I care to remember that sram chains do start to get noisy as you work your way up the cassette !...its' shimanos way of saying your using the wrong chain for our HG/IG cassettes....try a HG70 and the noises go away...........
__________________
Velosophy#1: It is better to have a bicycle and no money , than money and no bicycle ! Velosophy # 2 : "Winning is simple, but not easy." #3: "Give a man a fish and he shall eat for a day , teach him how to fish and he will sit in a boat and drink beer all day"