Moog RK623900 Suspension Control Arm and Ball Joint Assembly

The Moog RK623900 is a complete suspension control arm and ball joint assembly engineered to restore precise steering geometry and ride quality. Built to Moog's renowned Problem Solver standards, this assembly delivers a direct OE-style replacement with design enhancements that extend service life beyond the original equipment.

Moog engineers this control arm using heat-treated cast iron and steel construction with an e-coat finish for superior corrosion resistance. The pre-installed ball joint features a sealed socket design for maintenance-free operation, and the ball stud geometry is optimized to compensate for suspension sag while maintaining full range of motion.

Key Features:

• Installation Ready – Pre-installed ball joint with sealed socket eliminates the need for separate ball joint pressing
• Precision Engineered – Tight manufacturing tolerances ensure proper fit and simplify steering alignment at installation
• Optimized Bushings – Engineered for quiet operation with resistance to wear, salt, road grime, and oils
• Enhanced Structural Strength – Heat-treated to meet or exceed OE load and fatigue requirements
• Corrosion Protection – E-coated steel and coated ball studs inhibit premature deterioration
• Extended Ball Stud Life – Ball stud shape designed to maintain fatigue life and add extra articulation range

Moog's RK-series control arms carry a 3-year warranty and are backed by the brand's decades of chassis engineering expertise. This assembly is designed as a direct bolt-on replacement, helping restore factory handling characteristics with no modifications required.