When im driving at any speed, i turn and i can hear and feel a clunk noise under my feet any ideas what it could be? i was thinking it might be the knuckle

 

Trackbar, ball joints, motor/trans mounts, bushings, exhaust pipe, shocks. it could be lots of things. get under the jeep and start looking.

 

grease your front drive shaft. sounds dumb but its really easy so try it first. 60% of the time it gets rid of it, while your under there with the grease gun go ahead and grease everything

 

Have someone give you a hand for a few mins and inspect the frontend for yourself...have them turn the wheel left to right and see if you notice anything. My money is on the trackbar.

Before doing this be sure every bolt is tight and all the bushings are in fairly good condition...it would be foolish to neglect to do this.