Dorman 520-145 Suspension Control Arm and Ball Joint Assembly - Front Left Lower

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 520-145 suspension control arm and ball joint assembly is designed for reliable performance in Oldsmobile Montana, Pontiac Silhouette, and Pontiac Trans Sport vehicles. This pre-greased, steel control arm assembly offers a direct replacement solution to maintain proper suspension function and vehicle handling.

• Pre-greased for immediate use
• Includes rubber bushings and mounting hardware
• Steel construction with casting/forged control arm type
• Bolt-in ball joint with threaded stud (14 mm thread diameter)
• Compatible with Oldsmobile Montana, Pontiac Silhouette, and Pontiac Trans Sport

Product Features and Specifications

The Dorman 520-145 control arm assembly 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. It includes one mounting hole with a diameter of 12.3 mm, and the ball joint is installed and ready for bolt-in mounting. Rubber bushings are included to reduce vibration and noise, enhancing ride comfort. Mounting hardware is also provided for a complete installation.

Compatible Vehicles and Applications

This suspension control arm and ball joint assembly is compatible with select GM minivans, specifically the Oldsmobile Montana, Pontiac Silhouette, and Pontiac Trans Sport models. It is designed to restore proper suspension geometry and improve steering response for these vehicles, ensuring safe and stable handling.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing excessive play
• Ball joint wear leading to steering looseness or noise
• Corroded or bent control arms affecting alignment
• Vibration or uneven tire wear due to suspension component failure
• Difficulty maintaining proper suspension geometry

Installation Notes and Tips

Installation of the Dorman 520-145 control arm assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and pre-greased, no additional greasing is necessary. Ensure the mounting hole aligns correctly with the vehicle frame and torque all bolts to manufacturer specifications. It is recommended to perform a wheel alignment after installation to maintain proper handling and tire wear.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards. The 520-145 control arm and ball joint assembly undergoes rigorous quality checks to ensure durability and fitment accuracy. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship.