lower ball joint, these are non greasable so the leak means it is or will soon be toast. if you jack up the car on that side and grab the tire top and bottom and pull it should not move. its not an easy fix, you have to remove the springs and lower arm to pound the old out and press in a new one. or if you have the special tool i think it can be done on the car. problem is all of the suspension is probably also worn.

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)