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Jeep With Broken Front Axle

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If you try the obstacle again and one of your front axle U-joints is broken, the two axleshafts will push past one another and pop the ball joints out of the inner knuckle. If this happens your wheel will fall off and you will need a new U-joint, new axleshafts, new upper and lower ball joints, possibly a new knuckle, and probably even a new brake line. Guess what? Putting new ball joints in requires a special tool that even the most prepared wheelers usually don’t carry on the trail.