Dorman 520-155 Suspension Control Arm and Ball Joint Assembly - Front Left Lower

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 520-155 suspension control arm and ball joint assembly is engineered for reliable performance in Buick Century, Oldsmobile Intrigue, Pontiac Grand Prix, and Regal models. Designed with pre-greased components and included bushings, this assembly ensures smooth suspension operation and improved vehicle handling.

• Pre-greased for immediate use and reduced maintenance
• Includes rubber bushings for vibration dampening
• Steel construction with casting/forged control arm for strength
• Bolt-in ball joint with threaded stud for secure mounting
• Mounting hardware included for straightforward installation
• Compatible with Buick Century, Oldsmobile Intrigue, Pontiac Grand Prix, and Regal

Product Features and Specifications

This suspension control arm and ball joint assembly (part number 520-155) features a light suspension grade type suitable for regular driving conditions. The control arm is constructed from durable steel with a black finish, measuring up to 288.5 mm in width and 237 mm in length. The assembly includes rubber bushings to absorb road shocks and reduce noise. The ball joint is pre-installed with a threaded stud type and a 14 mm thread diameter, mounted securely with a bolt-in design. One mounting hole with a diameter of 12.3 mm is included, along with all necessary mounting hardware for a complete replacement.

Applications and Common Repair Uses

This Dorman control arm and ball joint assembly is compatible with specific GM vehicles, including Buick Century, Oldsmobile Intrigue, Pontiac Grand Prix, and Regal. It is designed to address common suspension issues such as:

• Worn or damaged control arm bushings causing steering instability
• Loose or failing ball joints leading to uneven tire wear
• Suspension noise or vibrations during driving
• Alignment problems affecting vehicle handling
• Corrosion or structural damage to original control arms

Installation Notes and Tips

Installation of the Dorman 520-155 assembly requires basic suspension repair tools. Since the ball joint is pre-installed and the control arm is pre-greased, the assembly is ready for immediate installation. Ensure the vehicle is properly supported and aligned after replacement. Torque all mounting bolts to manufacturer specifications. This assembly is not adjustable, so alignment checks post-installation are recommended to maintain proper suspension geometry.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for fit and function. The 520-155 control arm and ball joint assembly undergoes rigorous quality control to ensure durability and performance. This product includes a limited warranty covering defects in materials and workmanship, providing confidence in long-term reliability for Buick Century, Oldsmobile Intrigue, Pontiac Grand Prix, and Regal owners.