JL/JT HD Ball Joint Kit - Non Knurl (2 Upper & 2 Lower)

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JL/JT HD Dana 44/30 Upper & Lower Ball Joint Set

TeraFlex JL / JT: HD Ball Joints are engineered to handle the increased load caused by oversized tires and offset wheels. Fits all JL Wrangler/Unlimited and JT Gladiator models with Dana 30 or Dana 44 front axles.


  • JL Wrangler (2-door)
  • JL Wrangler Unlimited (4-door)
  • JT Gladiator (pickup)
  • Dana 30 Front Axle
  • Dana 44 Front Axle


  • Upper Ball Joints – pair
  • Lower Ball Joints – pair

Features & Benefits:

  • 30mm (1.18”) adjustable ball stud for accurate initial and future preload adjustments using simple hand tools Heat-treated 4140 chromoly ball studs
  • Heat-treated 1045 carbon steel housing and threaded retaining ring
  • Magnesium Phosphate coating provides corrosion resistance and decreases friction
  • Hard alloy tool steel slotted wear plate for ball stud to socket wear protection
  • Wear plate features dual helical grease channels for increased flow through entire joint ensuring longevity and predictable operation
  • Grease channels also allow spent grease to exit through low-profile seal
  • Includes factory style slotted nuts and cotter pins
  • Low-profile single lip dust seal prevents contaminants and eliminates concerns for torn conventional dust boots
  • Heavy-duty snap ring on upper ball joint prevents ball joint separation from the axle during extreme off-roading
  • Ball joint preload adjustability provides the end user with near effortless wear adjustment
  • Preload adjustment requires simple tools and can be performed with the vehicle on the ground
  • Simple locking mechanism w/ 1 screw and revised geometry so adjustment tool doesn’t slip as easily
  • 2 grease zerk fittings allow greasing access from either side
  • Grease zerks are accessible with axle shafts installed even w/ larger RCV shafts


  • Ball Joints w/out Knurl won’t score the inner knuckle and open the bore.
  • Ball Joints w/ Knurl are for inner knuckles that have a “loose press fit” due to repeated ball joint replacement and/or where knurled ball joints have been installed.