2000 Z28, 45000 mi, stock equip only, - - "click" has evollved into a pronounced , loud "rattle", especially during a turn at 15 to 30 mph. I am sure that noise is still there at higher speeds ,but lets face it, one noise has lots of comp. in a Camaro. Local dealer was told by GMPP (ext. warranty group) that noise was "normal" and they woulfd NOT honor any claim for repair of this "click", in spite of the fact that NONE of them have heard to noise in my car!!! I doubt that any portion of original quote from vendor had a clause where the diff. had to have a loud rattle as part of the "normal" performance of said diff. Any others exp. this noise and deaf "ear" from GM.