Front End Knock?!?!

[RoadWarrior]

Something seems to be up with teh front end on my 88. When you turn the wheel from lock to lock it makes a somewhat loud knock every once in a while. Its really noticable when your driving around slowly like pulling out of the garage or in a parking lot. Ive checked the front end bearings and they are good and tight. I greased up the tie rod ends, and it still does it. I crawled under the car while someone turned the wheel and i couldnt see anything binding or hitting when the sound occured. I dont know what else it could be. Im thinking about getting a front end bushing kit. Does anyone know what it could be? Any and all help will be appreciated.