Dorman 520-393 Suspension Control Arm and Ball Joint Assembly - Front Left Lower

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 520-393 suspension control arm and ball joint assembly is engineered for reliable performance in Buick DTS and Cadillac Lucerne models. Designed with quality materials and pre-installed components, this assembly ensures a precise fit and smooth suspension operation.

• Pre-greased ball joint for immediate use
• Includes rubber bushings and mounting hardware
• Aluminum control arm with black finish for corrosion resistance
• Press-in ball joint with threaded stud for secure mounting
• Compatible with Buick DTS and Cadillac Lucerne suspension systems

Product Features and Specifications

This suspension control arm and ball joint assembly (part number 520-393) features a light suspension grade type suitable for regular driving conditions. The control arm is made from durable aluminum with a casting/forged construction, measuring up to 288.5 mm in width and 237 mm in length. It includes one mounting hole with a diameter of 12.3 mm, and the ball joint is installed and ready to use, featuring a 14 mm threaded stud. Rubber bushings are included to reduce vibration and noise, and all necessary mounting hardware comes with the package.

Compatible Vehicles and Applications

This assembly is specifically designed for use with Buick DTS and Cadillac Lucerne models, ensuring proper fitment and suspension performance. The Dorman 520-393 part number matches the OEM specifications for these vehicles, making it a suitable replacement for worn or damaged control arms and ball joints.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing steering instability
• Loose or failing ball joints leading to uneven tire wear
• Suspension noise due to degraded rubber bushings
• Alignment problems resulting from bent or cracked control arms
• Reduced handling performance and ride comfort

Installation Notes and Tips

Installation of the Dorman 520-393 control arm and ball joint assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and pre-greased, no additional lubrication is necessary. Ensure all mounting hardware is securely tightened to manufacturer torque specifications. It is recommended to perform a wheel alignment after installation to maintain proper suspension geometry and tire wear.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards. The 520-393 assembly undergoes rigorous quality checks to ensure durability and fitment accuracy. This product includes a limited warranty covering defects in materials and workmanship under normal use conditions.