QA1's Ultimate Ball Joint is available in a Press - In Style for a variety of Mustangs. A 100 owner rebuildable design, the Ultimate Ball Joint is a QA1 exclusive. This patented, self - lubricating ball joint is offered with multiple stud lengths, providing for easy geometry changes on your vehicle. Ultimate Low Friction Operation - Get a completely smooth, bind - free operation with infinite preload adjustment that allows breakaway torque to be set as low as 0 ft. lbs. Wear Resistant Design - Precision tolerance ball - to - race conformity results in even load distribution for unsurpassed wear resistance. Precision ground 52100 bearing steel race ensures long life and ultra - smooth operation. On - the - Car Adjustability - No need to remove the ball joint from the car for adjustment. Self - Lubricating - Fully greasable enhanced by self - lubricating components to ensure smooth operation. Multiple Stud Lengths Available - Various ball studs are available for easy geometry changes. Fine tune your roll center. Owner Rebuildable - Rebuilding is simple. All parts are replaceable at economical prices.