I have developed a very very slight whine at 4k. There is nothing before or after just at 4K. It is not from the engine, that I'm sure of. When I drive with the window open you can hear it if you are aware of it. Seems to be coming from the ??????? I recently had a clutch and driveshaft center bearing replaced. Could this be causing the slight whine? It is definitely not coming from below me as before when the center bearing was squealing. I have not driven on the highway yet. So I don't know if it will be any different. This is very irritating.