My '72 has almost 53K on it. I will visually check the busings and see if they need replacing. I won't make the mistake of masking a problem that needs fixing, been there done that! At first it was not very noticeable, but the last few days have been quite a change. As long as the pavement I'm driving on is smooth, I hear nothing. It's when I hit bumpy roads, pulling in a driveway, or things in that nature that the noise is created. This weekend I will examine the Rivi and try to figure out what the problem is. Thanks for the advice fellas, it's greatly appreciated.