Heavy Duty Replacement Ball Joints Jeep Cherokee XJ/Comanche MJ/Wrangler TJ Rough CountryHeavy Duty. Ball joints are a common wear item on any Jeep that can produce vibrations, steering wander or even clunking noises. When installing a lift kit on your Jeep it's a great time to replace the weak factory ball joints with a heavy duty joint that is designed to handle the additional stresses of oversize tires. Rough Country's replacement ball joints are designed from the ground up to give you a stronger, longer lasting ball joint that is a