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Treacle JK/JKU Heavy-Duty Ball Joints are engineered to handle the increased load caused by oversized tires and offset wheels. FITS: • JK Wrangler (2-door) w/ Dana 30 or 44 axle • JKU Wrangler Unlimited (4-door) w/ Dana 30 or 44 axle INCLUDES: • Upper ball joints w/ knurl - pair • Lower ball joints w/ knurl - pair UPPER BALL JOINT FEATURES • Extremely hard sintered wear bushings to handle extreme side load demands w/out failure • Magnesium Phosphate coating to inhibit corrosion throughout • Heat treated 4140 chromo ball/stud & 1045 carbon steel housing • Factory-style serrated flange nut & grease fitting LOWER BALL JOINT FEATURES • 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 chromo 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 zero 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 NOTE: • 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. INSTALL TIME: 4 Hours