1,000,000 MILE WARRANTY. You can install our ball joints with confidence knowing that every part we sell is backed by our industry-leading 1,000,000 mile limited warranty. We can offer this because our parts are engineered, tested, re-tested, and subject to strict quality control procedures our quality is second to none. CRAZY STRONG BALL JOINTS. Proforged ball joints are built using some of the toughest steel on the planet. Forged SAE4140 chromoly steel studs are enclosed in forged SAE1045 housings, heat treated for strength and durability, and every fit surface is CNC machined for precision fit and finish. Each unit is sealed with specially-designed CR-rubber boots for ultimate durability. BUILT FOR PROFESSIONALS. There's a reason why the most well-respected performance suspension brands use Proforged ball joints we're fanatical about quality, performance, and durability. Professionals save time and money with our competitively-pr