bdydrped
+1y
its the intermediate stearing shaft making that noise, if you pay reall close attention you can feel a bump in teh wheel also.
there is a bulletien that GM will either replace or lube the intermediate steering shaft if its under warranty, or you can go to the delaership and buy the lube kit and do it your self for 14.91 plus tax...( part # 26098419) or get teh shaft for aorund 100( 2 differnt part numbers depending when yours was assembled,or if it had been replaced before)...
hope that helps.