My 99 passport 2wd has a mysterious knock when turning sharply. It will only do it once if you stay in drive. If you go in reverese it will do it once with a sharp turn. After examining the ball joints, tierod ends, and the sway bar, I saw that the ball joints were shot, tierod ends were ok, but i replaced them any way. The bump is no where near as noticable, but there is still a small bump. All new parts. Other than possibly getting faulty parts, what coulb be causing that knock. btw,, the bump can be felt slightly in the brake pedal.