These ball joints never have to come back out.
Lower ball joint bearing surfaces are CNC machined from 4140 steel, heat treated, induction hardened, and ferritic nitrocarburized to make these the longest lasting, longest wearing ball joints on the market.07-18 Wrangler JK, 2 & 4 Door;99-04 Grand Cherokee WJ;Non-knurled version;Tightens sloppy steering;Designed to last the life of the vehicle;Never need to replace ball joints again;Best in class price/performance ratio;Kit includes all 4 ball joints and lower ball joint adjuster tool;Lower ball joints are rebuildable on the vehicle without removal;Lower Ball Joint bearing surfaces are CNC machined from 4140 steel, heat treated, induction hardened, and ferritic nitrocarburized for extreme wear resistance;Low profile dust boots are made from thick nitrobutile rubber;Protects the joint from contaminants and eliminate any chance of tearing;Zerk fittings included for trouble-free maintenance;Limited Lifetime Warranty;California Residents: WARNING This is the last set of ball joints you will ever have to buy. Available in knurled and non-knurled versions to fit all vehicles regardless of what type of ball joints were installed previously. Synergy Heavy-Duty Adjustable Ball Joints (Non-Knurled) - 4127 Kit includes all 4 ball joints to service one Jeep and the adjuster tool for adjusting the preload on the lower ball joints.