When TeraFlex developed our heavy-duty, wear adjustable ball joints for the JK Wrangler, the lifetime warranty and ease of greasing and durability made them a must have. Oddly enough the JL Wrangler and JT Gladiator has the same factory ball joint issues as the JK did. They don’t seem to be able to handle the abuse we give them when we throw on a set of gargantuan tires and hundreds of pounds of must have accessories and equipment. Then we ruthlessly pound our Jeeps down some trail… Hey it’s wha