Pitman arm makes popping sound when moving wheel left to right. Should i just replace that or steering box on ford f550 2006 ?

Pitman arm makes popping sound when moving wheel left to right. Should i just replace that or steering box on ford f550 2006 ?

Pull it off and look at the splines. If the splines are worn on the Pitman arm, replace it. If they are worn on the steering box, replace it. If neither, check the mounts for the steering box.