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The Synergy Heavy Duty Ball Joint Set is designed to replace your Jeep Wrangler JK's factory ball joints which are prone to premature failure on lifted vehicles with larger offroad tires. These ball joints fully greasable sintered metal on bushing design has high wear resistance and will outperform the factory ball joint assembly.
Notes:
** 4121 Series Ball Joints DO NOT fit TBB D44 setups. These only fit standard straight axle D44's
*** 4125 Series Ball Joints fit TBB axles only
**** Synergy Suspension HD Ball Joints are compatible with RCV axles
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