2005 Chevy Impala noise when car starts moving forward

When I start to move forward and turn to either the right or left there is a noise in the frontend. It also viabrates at aroud 65 mph. I replaced all four tires and had them balanced and viabration is still there. I was told that the problem was the intermediate steering shaft. It sounds more like a nuckle problem to me but I am not sure.
Can you help