Knocking in front

I have a knock that I hear when going over bumps...I replaced the sway bar end links and that didn't help it. There is a TSB on some bolts that I am going to try next. The other thing it could be I guess is the steering rack...does anyone have photos of what to do when adjusting the steering rack...I would like to hear other suggestions on what it might be....I looked at all of the ball joints when I had the tires off doing the end links and they all look fine.