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Some models and years of Pontiacs had a pivot joint in the idler arm where it attaches to the centerlink. Others had the pivot in the centerlink. If the centerlink has no pivot then the wear joint is in the idler and the pitman arm. The idler arm (shown) should not exhibit up and down travel when you push up and pull down on it. With the front tires on the ground, have a helper slowly turn the steering wheel back and forth, while you watch for proper movement of the pitman arm, centerlink, tie rods, and idler arm. Everything should move the instant the wheel is turned.