Dorman 520-979 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Rearward

Overview of Dorman Suspension Control Arm 520-979

The Dorman Suspension Control Arm and Ball Joint Assembly 520-979 is designed for select Mercedes-Benz models including the S55 AMG, S65 AMG, S350, S430, S500, and S600. This control arm provides a reliable replacement option for maintaining proper suspension geometry and vehicle handling.

• Compatible with Mercedes-Benz S-Class models: S55 AMG, S65 AMG, S350, S430, S500, S600
• Constructed from durable iron with a black finish for corrosion resistance
• Includes rubber bushings and mounting hardware for straightforward installation
• Machined ball joint mounting type with threaded ball joint stud (14 mm thread diameter)
• Light suspension grade type suitable for regular driving conditions
• Control arm dimensions: maximum length 237 mm, maximum width 288.5 mm
• Single mounting hole with 12.3 mm diameter

Detailed Product Description

The Dorman 520-979 suspension control arm is a casting/forged iron component engineered to meet the specifications of various Mercedes-Benz S-Class vehicles. It features rubber bushings that help absorb road vibrations and reduce noise, contributing to a smoother ride. The control arm is not pre-greased and does not include a grease fitting, reflecting its maintenance-free design. The ball joint is not included or installed, but the control arm is designed with a machined mounting surface and a threaded ball joint stud interface to accommodate compatible ball joints. This assembly comes with all necessary mounting hardware, simplifying the replacement process.

Common Applications and Problem Resolution

• Restores proper suspension alignment and handling performance
• Replaces worn or damaged control arms causing uneven tire wear
• Eliminates clunking or knocking noises from suspension movement
• Addresses issues with steering instability or poor vehicle control
• Improves ride comfort by maintaining correct suspension geometry

Installation Notes and Tips

Installation of the Dorman 520-979 control arm requires basic suspension knowledge and tools. Ensure the vehicle is securely lifted and supported before beginning. Since the ball joint is not included, verify compatibility with your existing ball joint or source a matching replacement. The included mounting hardware facilitates a direct bolt-on installation. Torque all fasteners to manufacturer specifications to maintain safety and performance.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for fit, form, and function. While this product does not come pre-greased or greaseable, it is designed for durability under regular driving conditions. The 520-979 control arm includes a limited warranty against defects in materials and workmanship, providing confidence in its reliability for Mercedes-Benz S-Class suspension repairs.