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Support That Attitude. Your Jeep was cool from the factory but let’s face it adding some bigger wheels and tires whether you have lifted your Jeep or not adds some serious attitude and traction. Whether you want the look or the performance you need to support the heavier rolling weight of those wheels and tires. The TeraFlex HD Dana 44/30 Upper Lower Ball Joint Kit is the heavy duty solution to handling that additional weight. Built Tough. Starting with heat treated 4140 chromoly for the balls and 1045 carbon steel for the housings these joints are rugged. Hard sintered wear bushings things like grease channels in the wear plate and two zerk fittings on the adjustable end caps and a magnesium phosphate coating to resist corrosion make these rugged replacements easy to live with as well. Installation Notes. As cool as these ball joints are this is an involved installation that requires knowledge of your Jeep and its suspension/drivetrain. You will also need the appropriate tools. If you don’t have the tools or knowledge or don’t feel comfortable in doing the work it is recommended that you take this part to a professional and have them conduct the replacement. For complete details and terms contact TeraFlex directly. Application. Note: TeraFlex recommends ball joints without knurls as they will not score the inner knuckle and open up the bore. TeraFlex does off ball joints with knurls for ball joints that have a loose press fit in the inner knuckle due to repeated ball joint replacement or if knurled ball joints have been installed in the past.