Dorman 520-947 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper

Overview of Dorman Suspension Control Arm and Ball Joint Assembly

The Dorman 520-947 suspension control arm and ball joint assembly is engineered for select Mercedes-Benz ML-Class models, including ML55 AMG, ML320, ML350, ML430, and ML500. This assembly combines a durable aluminum control arm with a pre-installed ball joint, designed to restore proper suspension function and vehicle handling.

• Pre-greased ball joint for immediate use
• Includes rubber bushings and mounting hardware
• Aluminum control arm with casting/forged construction
• Press-in ball joint with threaded stud (14 mm thread diameter)
• Compatible with Mercedes-Benz ML55 AMG, ML320, ML350, ML430, ML500

Detailed Product Features and Specifications

The Dorman 520-947 control arm assembly features a lightweight aluminum construction that balances strength and corrosion resistance. The control arm measures up to 288.5 mm in width and 237 mm in length, with a single 12.3 mm mounting hole for secure installation. The included rubber bushings help absorb road vibrations, contributing to a smoother ride. The ball joint is press-in mounted and comes pre-installed with a threaded stud, eliminating the need for additional assembly. This assembly is pre-greased but does not include a grease fitting, designed for regular suspension grade use in light-duty applications.

Compatible Vehicles and Application

This suspension control arm and ball joint assembly is compatible with the following Mercedes-Benz models:

• ML55 AMG
• ML320
• ML350
• ML430
• ML500

It is designed to replace worn or damaged control arms and ball joints, restoring proper suspension geometry and vehicle stability.

Common Issues Addressed by This Assembly

• Excessive suspension noise or clunking
• Uneven tire wear due to misalignment
• Loose or unstable steering feel
• Vibration or harshness over bumps
• Worn or damaged ball joints and bushings

Installation Notes and Tips

Installation of the Dorman 520-947 control arm and ball joint assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and pre-greased, no additional greasing is necessary during installation. Ensure all mounting hardware is torqued to manufacturer specifications. This assembly is not adjustable, so alignment should be checked and corrected after installation. Compatible with the specified Mercedes-Benz ML models, verify fitment before installation.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards. The 520-947 assembly includes all necessary bushings and mounting hardware for a complete replacement. While specific warranty details are not provided here, Dorman typically offers limited warranties covering defects in materials and workmanship. Refer to Dorman’s official documentation for exact warranty terms.