Dorman 521-878 Suspension Control Arm and Ball Joint Assembly - Front Right Lower

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 521-878 suspension control arm and ball joint assembly is engineered for reliable performance in Chevrolet, GMC, and Hummer trucks and SUVs. Designed to meet regular suspension grade requirements, this assembly ensures proper steering and suspension function for heavy-duty vehicles like the Silverado 2500 HD and Yukon XL 2500.

• Pre-greased for immediate installation and smooth operation
• Includes rubber bushings and mounting hardware for a complete replacement
• Steel control arm with casting/forged construction for strength and durability
• Press-in ball joint with threaded stud for secure mounting
• Compatible with multiple Chevrolet, GMC, and Hummer models including Avalanche 2500 and Sierra 3500 HD

Product Features and Specifications

This suspension control arm and ball joint assembly (part number 521-878) features a black steel control arm with a maximum length of 237 mm and width of 288.5 mm. The assembly includes rubber bushings to absorb road vibrations and reduce noise. The ball joint is pre-installed and press-fitted with a 14 mm threaded stud, ensuring a secure connection to the vehicle’s suspension system. Mounting hardware is included, and the control arm has one mounting hole with a diameter of 12.3 mm. This assembly is designed for light suspension grade applications and is not adjustable.

Compatible Vehicles and Applications

This Dorman suspension control arm and ball joint assembly is compatible with a range of Chevrolet, GMC, and Hummer models, including:

• Chevrolet Avalanche 2500
• GMC Sierra 1500 HD, 2500, 3500, and their Classic and HD variants
• Chevrolet Silverado 1500 HD, 2500, 3500, and Classic versions
• GMC Yukon XL 2500
• Hummer H2
• Chevrolet Suburban 2500

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 suspension alignment
• Loose or missing mounting hardware compromising suspension integrity
• Pre-greased ball joints reducing maintenance needs and improving longevity

Installation Notes and Tips

Installation of the Dorman 521-878 control arm and ball joint assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and press-fitted, no separate ball joint replacement is necessary. Ensure the mounting hole aligns properly with the vehicle’s frame and torque all hardware to manufacturer specifications. This assembly does not include a grease fitting, so no additional greasing is required after installation.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for fit, form, and function. The 521-878 control arm and ball joint assembly undergoes rigorous quality checks to ensure durability and performance. While specific warranty details vary, Dorman typically offers a limited warranty covering defects in materials and workmanship.