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TeraFlex HD Replacement Upper & Lower Ball Joint Kit with Knurl (For D44 & D30 - One Side Only) by Teraflex

Part no: TF-3440020

TeraFlex HD Replacement Upper & Lower Ball Joint Kit with Knurl (For D44 & D30 - One Side Only)

Special Price $119.69

Regular Price: $125.99

You save 5% ($6.30) + free Shipping

You save 5% ($6.30)

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This product fits only specific vehicles. Select your vehicle to ensure it fits.

Product Details

Important Notes:

  • This is for ONE SIDE ONLY!
  • You Will Need To Purchase Qty. 2 If Doing Both Sides Of Your Jeep!


  • 2007-2017 Jeep Wrangler JK
  • 2007-2017 Jeep Wrangler Unlimited JK


TeraFlex JK HD Ball Joints replace the weak factory ball joints that are unable to handle the demands of repeated off road use or larger tires. Ball joints without knurls will not score the inner knuckle and open up the bore. The upper ball joint has two sintered metal bearings to handle the rotational load and the lower ball stud rides in a metal cup that is threaded to provide for a precise pre-load. In-between the lower ball joint threaded cup and ball stud is a special plate spring made from high carbon tool steel for excellent wear resistance as the lower joint must bear the vehicle weight. The lower ball joint also features an oversized flanged nut for a good bearing surface against the outer knuckle. Both ball joints have grease zerks that are easy to service. The lower ball joint has a special flush needle zerk that is offset for u-joint clearance and ease of maintenance.

Product Details:

  • The Ball Joint Studs are made from 4140 Chrome Moly Steel for high harden-ability.
  • Ball Joints are heat treated to provide excellent fatigue and abrasion resistance.
  • Weak factory plastic cups have been eliminated

Parts Included:

  • (1) Front Upper HD Ball Joint
  • (1) Front Lower HD Ball Joint

Years Covered:

2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 and 2017

For California residents: Proposition 65 Warning

Vehicle Fitment

2007-2018JeepWrangler JK Unlimited
2007-2018JeepWrangler JK

Additional Information

SKU Aliases3440020

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