Proforged SuperTravel ball joints are built with an angled housing to give you insane travel with stock upper control arms - allowing you to lay frame on 28.75in tires with tubular lower arms and drop spindles! 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. Note: you must replace both sides at once, and these are sold individually. 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. 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-priced products that outlast inferior brands. Do the job with confidence, replace your worn components with the leader in performance ball joints: Proforged. A ball joint is an enclosed spherical bearing that connects the control arm to the steering knuckle or spindle - it is a ball-and-socket design, just like your hip, and it needs to be replaced as it wears out. A worn ball joint causes poor han dling and makes it difficult or impossible to achieve an alignment, which leads to rapid tire wear. Replacing your worn ball joints gives a noticeable improvement in steering feel, handling, and safety.