The design and engineering features of Moog ball joints ensure that our products will deliver the performance and durability necessary to meet the demanding needs of our customers. The ball-joint housings are forged and/or machined from a single block of fine-grain alloy steel, providing unequaled strength and durability. Powdered-metal gusher bearings, with grease grooves, resist wear better than conventional designs. Moog's innovative approach allows grease to flow through the bearing to the stud and provides a smooth, durable surface that extends service life. Moog's design also transfers the load to the housing and provides strength and stability. Patented pressed-in cover plates minimize radial and axial deflection, securing a solid-steering feel. Moog uses premium polychloroprene and polyurethane superior compounds that stand up to temperature extremes, dirt and abrasion to seal the boots on our ball joints. In addition, the ball joint boots are fitted with grease relief valves. These features help prevent contamination and allow debris to be flushed out when the ball joint is serviced.Pit Stop USA offers Moog Performance Upper Ball Joints (Pair) - 57-89 Chrysler/Dodge/Plymouth - Lefthander Style Upper A-Frames - Screw-In MP1004 at low everyday prices. Be sure to check out all of our products from Moog including Moog Screw-In Upper Ball Joints.