Dorman 520-125 Suspension Control Arm and Ball Joint Assembly - Front Left Lower

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 520-125 suspension control arm and ball joint assembly is engineered for reliable performance on Chevrolet and GMC trucks. Designed specifically for Sierra 1500, Sierra 1500 Classic, Silverado 1500, and Silverado 1500 Classic models, 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 control arm with casting/forged construction for strength and durability
• Bolt-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 (part number 520-125) features a black steel control arm measuring up to 288.5 mm in width and 237 mm in length. 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 bolt-in with a 14 mm threaded stud and a 12.3 mm mounting hole diameter, ensuring a secure fit. Mounting hardware is also provided for convenience.

Compatible Vehicles

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

• Chevrolet Sierra 1500 and Sierra 1500 Classic
• GMC Sierra 1500 and Sierra 1500 Classic
• Chevrolet Silverado 1500 and Silverado 1500 Classic

Common Applications and Problem Resolution

This assembly is designed to address several suspension-related issues, including:

• Worn or damaged control arms causing poor handling or alignment problems
• Ball joint wear leading to steering looseness or uneven tire wear
• Excessive suspension noise due to deteriorated bushings
• Vibration or instability during driving
• Failed or corroded mounting hardware affecting suspension integrity

Installation Notes and Tips

Installation of the Dorman 520-125 control arm and ball joint assembly requires basic suspension knowledge and tools. Since the assembly comes pre-greased and includes bushings and mounting hardware, it simplifies the replacement process. Ensure the vehicle is properly supported and aligned after installation. The bolt-in ball joint with threaded stud allows for straightforward mounting without the need for press tools.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 520-125 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.