To inspect the balljoint, lift the vehicle and securely support it on jackstands. Evaluate the condition of the rubber seal. If you see any cuts, tears, or leaking grease, the balljoint should be replaced. Use a large prybar under the balljoint to push it up and put it between the steering knuckle and the arm to apply downforce. Any movement during these checks indicates a failing ball joint. Get an assistant to shake the wheel in and out. Meanwhile, you touch the castellated nut on the balljoint stud. If you feel looseness in that area, suspect a worn balljoint stud or a loose fit in the hole in the steering knuckle boss. If so, you should replace the steering knuckle and the balljoint. To replace the upper
Control Arm balljoint, the upper arm must be removed and taken to a dealer or an appropriately equipped shop to have the old balljoint pressed out and a new one installed. To replace the lower control arm balljoint on 2WD models, the front spring and steering knuckle have to be removed followed by detaching of the balljoint from the control arm to install a new balljoint followed by reassembling. If the vehicle is a 4WD model, support the lower arm with a floor jack. Remove the wheel, then loosen the castellated nut (you don't need to take it off yet). Use a balljoint separating tool to release the balljoint from the steering knuckle. Take off the castellated nut, unclip the balljoint from the arm, and make sure the new balljoint is the same way as the old one. The new balljoint must be installed and the nut or bolts tightened. The balljoint stud must then be inserted into the boss of the steering knuckle. Finally, tighten the castellated nut and install a new cotter pin. Once you install the wheel and lug nuts, lower your vehicle and tighten the nuts to the specified torque.