Dorman 521-381 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 521-381 suspension control arm and ball joint assembly is engineered for reliable performance in Ford, Lincoln, and Mercury vehicles. Designed specifically for models like the Aviator, Explorer, and Mountaineer, 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
• Constructed from durable aluminum with a black finish for corrosion resistance
• Press-in ball joint with pinch stud type, installed and ready to use
• Compatible with light suspension grade applications

Product Features and Specifications

This suspension control arm and ball joint assembly (part number 521-381) features a casting/forged aluminum control arm designed for strength and reduced weight. The assembly comes pre-greased, eliminating the need for additional lubrication during installation. Rubber bushings are included to absorb vibrations and provide a smoother ride. The ball joint is press-in mounted with a pinch stud type and a 14 mm thread diameter, ensuring secure attachment and reliable steering response. Mounting hardware is included, and the control arm has one mounting hole with a diameter of 12.3 mm. The control arm measures up to 288.5 mm in width and 237 mm in length, finished in black for durability.

Compatible Vehicles and Applications

This Dorman suspension control arm and ball joint assembly is compatible with the following vehicles:

• Ford Aviator
• Ford Explorer
• Lincoln Aviator
• Mercury Mountaineer

It is designed for light suspension grade use, making it suitable for regular driving conditions and maintaining proper suspension geometry on these models.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing steering instability
• Faulty ball joints leading to uneven tire wear or clunking noises
• Corroded or bent control arms affecting alignment and handling
• Loose or missing mounting hardware compromising suspension integrity
• Reduced suspension performance due to lack of lubrication

Installation Notes and Tips

The Dorman 521-381 assembly comes pre-greased and includes all necessary bushings and mounting hardware for a straightforward installation. Since the ball joint is press-in mounted and already installed, no additional ball joint assembly is required. Ensure the mounting hole diameter of 12.3 mm matches your vehicle’s specifications. This control arm is not adjustable, so proper alignment after installation is recommended. Use appropriate tools to avoid damaging the aluminum control arm during installation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 521-381 suspension control arm and ball joint assembly undergoes rigorous quality checks to ensure durability and performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Refer to the product documentation for exact warranty terms.