Dorman 520-755 Suspension Control Arm and Ball Joint Assembly - Front Left Upper

Reliable Suspension Control Arm and Ball Joint Assembly for Mercedes-Benz

The Dorman 520-755 suspension control arm and ball joint assembly is designed specifically for Mercedes-Benz 300D, 300SD, and 300TD models. This pre-greased, aluminum control arm offers a durable and precise fit to maintain your vehicle's suspension performance.

• Pre-greased for immediate installation and reduced maintenance
• Includes rubber bushings and mounting hardware for a complete assembly
• Aluminum control arm with casting/forged construction for strength and lightweight performance
• Press-in ball joint with threaded stud for secure mounting
• Compatible with Mercedes-Benz 300D, 300SD, and 300TD models

Product Features and Specifications

The Dorman 520-755 control arm assembly features a light suspension grade type suitable for regular driving conditions. The control arm is constructed from aluminum with a black finish, measuring a maximum length of 237 mm and a width of 288.5 mm. It includes one mounting hole with a diameter of 12.3 mm and comes with rubber bushings installed to absorb vibrations and reduce noise. The ball joint is pre-installed, press-in mounted, and features a 14 mm threaded stud for secure attachment. Mounting hardware is included to facilitate installation.

Purpose and Common Applications

• Replaces worn or damaged suspension control arms on Mercedes-Benz 300D, 300SD, and 300TD
• Restores proper wheel alignment and suspension geometry
• Eliminates clunking noises and improves steering response
• Addresses excessive tire wear caused by faulty control arms or ball joints
• Improves overall ride quality and vehicle handling

Installation Notes and Tips

Installation of the Dorman 520-755 control arm and ball joint assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and the control arm is pre-greased, the assembly is ready for immediate installation. Ensure the mounting hole aligns correctly with the vehicle’s frame and torque all hardware to manufacturer specifications. This part is not adjustable, so proper alignment should be verified after installation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 520-755 suspension control arm and ball joint assembly undergoes rigorous quality checks to ensure durability and performance. This product includes a limited warranty covering defects in materials and workmanship under normal use.