steering noise/issue

[Johnny5]

I am experiencing some sloppyness in my steering right at top center of the wheel. It feels as if it has a few inches of play (not responsive enough, my 1994 LT1 was definitely more responsive hence why i think something is worn) and it is more noticeable at higher speeds. Also i turned the wheel back and forth with the car off and something is making a knock noise. My brother thinks it may be a worn steering box. Anyone have any experience or advice with these symptoms?