Dorman 521-877 Suspension Control Arm and Ball Joint Assembly - Front Left Lower

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 521-877 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 521-877) features a light suspension grade type suitable for regular use. The control arm is constructed from 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 comes with rubber bushings installed to reduce vibration and noise. The ball joint is press-in mounted and includes a threaded stud with a 14 mm thread diameter, pre-installed and pre-greased for maintenance-free operation. Mounting hardware is included to facilitate a straightforward installation process.

Compatible Vehicles and Applications

This assembly is compatible with a range of Chevrolet, GMC, and Hummer models, including:

• Chevrolet Avalanche 2500
• GMC Sierra 1500 HD, 2500 HD, 3500 HD, and their Classic variants
• Chevrolet Silverado 1500 HD, 2500 HD, 3500 HD, and Classic variants
• 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
• Reduced suspension performance due to lack of lubrication

Installation Notes and Tips

Before installation, verify vehicle compatibility with the Dorman 521-877 part number. The assembly comes pre-greased and includes all necessary bushings and mounting hardware, simplifying the replacement process. Use appropriate tools to press out the old ball joint and install the new assembly securely. Torque all mounting bolts to manufacturer specifications. Since this control arm is not adjustable, ensure proper alignment after installation.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for durability and fitment. The 521-877 control arm and ball joint assembly undergoes rigorous quality control to ensure reliable performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship.