I have an 06 powerwagon with a noise coming from my transfercase linkeage. At about 35 mph it is the loudest, when I put my hand on the lever it changes pitch but doesn't go away. I've taken in to my dealer and they replaced it with an updated linkeage. It doesn't seem to have helped the noise at all. Any advice? It changes pitch with speedand when I'm at a stoplight it goes away so I know it isn't in the engine.