WOW!!!!!!!!
They do make extra HD ball joints, whether or not they are available for your rig or not, dunno. You will need to stop by a NAPA store and ask them. Look at the Moog catalog or research on line.
In addition a failing ball joint is very noticeable long before failure. Find a REPUTABLE dealer or shop and ask them what signs the ball joint would show on YOUR specific vehicle. I would say loose sloppy steering, lagging steering response and front wheel shimmy or on Wranglers DW will begin. I am not familiar enough with the Liberty setup to give specific advice. There may be some folks on here or you may look for a Liberty forum.
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