I am actually going to be replacing my CV shafts soon, mechanic said they will need to be replaced. He said I will know if it goes bad because it will be a noticeable grinding noise. We noticed they were going bad while repacking the bearing. We will also be replacing bearing at the same time. So maybe have him check your CV shaft.

Here is a thread I started about replacing them:
http://vehicross.info/forums/showthr...threadid=25616