JK/JKU HD Dana 30/44 Upper & Lower Ball Joint Kit w/ Knurl - Set of 4

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  • Regular price $307.99

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TeraFlex JK/JKU Heavy-Duty Ball Joints are engineered to handle the increased load caused by oversized tires and offset wheels.

• JK Wrangler (2-door) w/ Dana 30 or 44 axle
• JKU Wrangler Unlimited (4-door) w/ Dana 30 or 44 axle


• Upper ball joints w/ knurl - pair
• Lower ball joints w/ knurl - pair


• Extremely hard sintered wear bushings to handle extreme side load demands w/out failure
• Magnesium Phosphate coating to inhibit corrosion throughout
• Heat treated 4140 chromoly ball/stud & 1045 carbon steel housing
• Factory-style serrated flange nut & grease fitting


• Hard alloy tool steel slotted wear plate for ball/stud to socket wear protection
• Wear plate features grease channels for increased flow through entire joint ensuring longevity & predictable operation
• Magnesium Phosphate coating to inhibit corrosion & friction throughout
• Heat treated 4140 chromoly ball/stud
• Huge 30mm (1.18") ball
• Factory style serrated flanged castle nut
• Ball joint pre-load adjustability provides the end user w/ near effortless wear adjustment (kit includes Preload Adjustment Tool)
• Low-profile single lip dust seal eliminates torn conventional dust boot concerns
• Adjustable ball stud retaining ring for accurate initial & future preload adjustments that can be done w/out any axle disassembly
• Adjustable preload can be performed w/ simple hand tools
• Adjustable end cap w/ two zerk fittings allow greasing access from either side w/out axle shaft removal even w/ larger RCV shafts
• Dual helical grease grooves machined in the retaining ring allow spent grease to exit through the low-profile seal
• Low-profile seal prevents contaminants, while allowing spent grease to evacuate from the ball joint


• We recommend Ball Joints w/out Knurls (# 3442002 or # 3440000) as they will not score the inner knuckle & open up the bore.

• We also offer Ball Joint w/ Knurls (# 3442022 or # 3440020) for ball joints that have a loose press fit in the inner knuckle due to repeated ball joint replacement or if knurled ball joints have been installed in the past.