Dorman 521-390 Suspension Control Arm and Ball Joint Assembly - Front Right Lower

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 521-390 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 installation and smooth operation
• Includes rubber bushings and mounting hardware for a complete replacement
• 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 Dorman suspension control arm and ball joint assembly (part number 521-390) features a boxed steel control arm finished in black for corrosion resistance. The assembly comes pre-greased, eliminating the need for additional lubrication during installation. Rubber bushings are included to reduce vibration and noise, while the ball joint is installed and ready to use. The ball joint mounting type is press-in with a threaded stud, featuring a 14 mm thread diameter. The control arm measures up to 288.5 mm in width and 237 mm in length, with a single mounting hole of 12.3 mm diameter. Mounting hardware is included to facilitate a straightforward installation process.

Compatible Vehicles and Applications

This suspension 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 designed for light suspension grade use, making it suitable for regular driving conditions and maintaining proper suspension geometry.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing steering instability
• Ball joint wear leading to uneven tire wear or clunking noises
• Loose or broken mounting hardware affecting suspension alignment
• Vibration and noise from deteriorated suspension components
• Reduced vehicle handling and control due to suspension component failure

Installation Notes and Tips

Before installation, verify vehicle compatibility with the Dorman 521-390 part number. The assembly comes pre-greased and includes mounting hardware, simplifying the replacement process. Use appropriate tools to press out the old ball joint if necessary, and ensure all mounting bolts are torqued to manufacturer specifications. Since this control arm is not adjustable, alignment should be checked and corrected after installation.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards. The 521-390 control arm and ball joint assembly undergoes rigorous quality checks to ensure durability and fitment accuracy. This part is backed by Dorman's limited warranty, providing coverage against defects in materials and workmanship under normal use.