Dorman 520-120 Suspension Control Arm and Ball Joint Assembly - Front Right Upper

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 520-120 suspension control arm and ball joint assembly is engineered for reliable performance in select Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac vehicles. Designed to meet regular suspension grade requirements, this assembly offers a pre-greased, bolt-in ball joint for straightforward installation and long-lasting durability.

• Pre-greased ball joint for immediate use
• Includes rubber bushings and mounting hardware
• Steel control arm with casting/forged construction
• Bolt-in ball joint with threaded stud (14 mm thread diameter)
• Compatible with multiple GM models including Bonneville, Caprice, DeVille, and Impala

Product Features and Specifications

This suspension control arm and ball joint assembly (part number 520-120) features a steel control arm finished in black for corrosion resistance. The assembly includes rubber bushings to absorb road vibrations and reduce noise. The ball joint is installed and pre-greased, eliminating the need for additional lubrication during installation. The bolt-in mounting style with a single 12.3 mm diameter mounting hole simplifies replacement. The control arm measures up to 288.5 mm in width and 237 mm in length, designed for light suspension grade applications.

Compatible Vehicles and Applications

This Dorman suspension control arm and ball joint assembly is compatible with a range of GM vehicles, including Buick LeSabre and Roadmaster, Cadillac Fleetwood and Brougham, Chevrolet Impala and Caprice, Oldsmobile Delta 88 and 98, Pontiac Bonneville and Safari, among others. It is designed to restore proper suspension geometry and handling characteristics in these models.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing steering instability
• Ball joint wear leading to uneven tire wear or clunking noises
• Corroded or bent control arms affecting wheel alignment
• Loose or faulty ball joint mounting impacting vehicle safety
• Vibration and poor ride quality due to suspension component failure

Installation Notes and Tips

Installation of the Dorman 520-120 assembly requires basic suspension tools and mechanical knowledge. The pre-greased ball joint eliminates the need for additional lubrication. Ensure the mounting hardware included is used to secure the control arm properly. Verify torque specifications according to the vehicle manufacturer’s guidelines. This assembly is not adjustable, so alignment should be checked and corrected after installation.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards. The 520-120 control arm and ball joint assembly undergoes rigorous quality checks to ensure durability and fitment accuracy. While specific warranty details vary, Dorman typically offers limited warranties covering defects in materials and workmanship to provide confidence in product reliability.