Moog RK621979 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Forward

Overview of Moog RK621979 Suspension Control Arm Assembly

The Moog RK621979 suspension control arm and ball joint assembly is engineered for precise fitment on select BMW models. Designed to restore suspension performance, this assembly integrates rubber bushings and a threaded ball joint stud for reliable operation without the need for grease fittings.

• Includes durable rubber bushings for vibration dampening
• Press-in ball joint mounting type with threaded stud
• Control arm maximum length of 15.840 inches
• Compatible with BMW 535i GT xDrive, 550i GT xDrive, 740Ld xDrive, 740Li xDrive, 750i, 750i xDrive, 750Li, and 750Li xDrive
• Non-adjustable design for direct replacement

Detailed Product Description

The Moog RK621979 suspension control arm and ball joint assembly is specifically designed for BMW vehicles including the 535i GT xDrive and 750Li xDrive models. This assembly features rubber bushings that help absorb road shocks and reduce noise, contributing to a smoother ride quality. The ball joint is press-in mounted and uses a threaded stud type, ensuring secure attachment and compatibility with factory suspension components. With a control arm maximum length of 15.840 inches, this part matches OEM specifications for proper suspension geometry and handling characteristics. The assembly does not include a grease fitting, reflecting a sealed design that requires minimal maintenance.

Common Applications and Problem Resolution

• Restores proper suspension alignment and handling on BMW 740Li xDrive and 750i models
• Eliminates excessive play or looseness in the control arm and ball joint connection
• Reduces vibration and noise caused by worn rubber bushings
• Addresses uneven tire wear related to faulty suspension components
• Improves steering response and vehicle stability

Installation Notes and Tips

Installation of the Moog RK621979 control arm assembly requires standard suspension tools and procedures. The press-in ball joint mounting type necessitates proper pressing equipment to ensure secure fitment without damage. Since the assembly is non-adjustable, alignment should be checked and corrected after installation to maintain optimal handling. The rubber bushings are pre-installed, simplifying the replacement process. No grease fitting is included, so no additional lubrication is required during installation.

Quality Assurance and Warranty

Moog suspension components are manufactured to meet or exceed OEM standards for durability and performance. The RK621979 control arm and ball joint assembly undergoes rigorous quality control to ensure fitment accuracy and long service life. While specific warranty details are not provided here, Moog typically offers limited warranties covering defects in materials and workmanship. Refer to official Moog documentation for complete warranty information.