Dorman 521-389 Suspension Control Arm and Ball Joint Assembly - Front Left Lower

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 521-389 suspension control arm and ball joint assembly is engineered for reliable performance in Chevrolet, GMC, and Oldsmobile vehicles. Designed specifically for models like the Bravada, Envoy, Envoy XL, Trailblazer, and Trailblazer EXT, this assembly ensures proper suspension function and vehicle stability.

• Pre-greased for immediate use without additional lubrication
• Includes rubber bushings and mounting hardware for a complete installation
• Steel boxed control arm construction for enhanced strength and durability
• Press-in ball joint with threaded stud for secure mounting
• Compatible with light suspension grade applications

Product Features and Specifications

This suspension control arm and ball joint assembly from Dorman features a boxed steel control arm finished in black for corrosion resistance. The assembly includes pre-installed ball joints with a 14mm threaded stud and press-in mounting type, ensuring a secure fit. Rubber bushings are included to reduce vibration and noise, and the package comes with all necessary mounting hardware. The control arm measures up to 288.5mm in width and 237mm in length, with a single 12.3mm mounting hole for precise installation. This assembly is designed for light suspension grade use and is not adjustable.

Compatible Vehicles and Applications

This Dorman 521-389 control arm and ball joint assembly is compatible with the following vehicles:

• Chevrolet Bravada
• GMC Envoy and Envoy XL
• Chevrolet Trailblazer and Trailblazer EXT
• Oldsmobile models within the same platform

It is intended for use in suspension systems requiring a reliable replacement part that maintains factory specifications.

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 missing mounting hardware compromising suspension integrity
• Vibration and noise from deteriorated suspension components

Installation Notes and Tips

Installation of the Dorman 521-389 assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and pre-greased, no additional lubrication is necessary. Ensure the mounting hole aligns correctly with the vehicle frame and torque all hardware to manufacturer specifications. This assembly is not adjustable, so proper alignment should be verified after installation. Professional installation is recommended for optimal safety and performance.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 521-389 suspension control arm and ball joint assembly undergoes rigorous quality control to ensure durability and reliability. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to Dorman’s official warranty policy for complete information.