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Willys Kingpin

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Willys pickups and Wagons used a driver-side upper kingpin with a cast-in steering arm. The steering arm exerts a lot of leverage on the bolts holding it to the soft cast-iron knuckle. Replacing the kingpin bolts with studs will help prevent the bolts loosening and damaging the knuckle, but periodically checking the fasteners can help prevent a major trail repair.