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Mevotech Tech Tip: Directional Ball Joints

Some ball joints must be installed in a specific orientation to function correctly. These ball joints are designed to allow for a large amount of ball stud swing in the cross-car or side-to-side direction as the suspension travels up and down.

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Some ball joints must be installed in a specific orientation to function correctly. These ball joints are designed to allow for a large amount of ball stud swing in the cross-car or side-to-side direction as the suspension travels up and down. 

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The trade-off is that they have less swing in the opposite or front-to-back direction. As a result, directional ball joints have an index mark on the housing in the form of a hole, dimple, notch, arrow, etc. 

These marks indicate which way the ball joint has the largest amount of swing and must point outboard, toward the wheel of the vehicle when installed. Failure to install a directional ball joint in the correct orientation could result in damage to the ball joint due to over travel of the ball stud.

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