Dorman 520-138 Suspension Control Arm and Ball Joint Assembly - Front Right Upper

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 520-138 suspension control arm and ball joint assembly is designed for reliable performance in light suspension applications. Pre-greased and equipped with rubber bushings, this assembly is compatible with various Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Pontiac models.

• Pre-greased for immediate use
• Includes rubber bushings and mounting hardware
• Steel construction with casting/forged control arm
• Bolt-in ball joint with threaded stud (14 mm thread diameter)
• Compatible with multiple GM and Isuzu vehicles including Blazer, Malibu, and S10

Product Features and Specifications

This suspension control arm and ball joint assembly (part number 520-138) features a durable steel control arm with a black finish, measuring up to 288.5 mm in width and 237 mm in length. The assembly includes a pre-installed ball joint with a 14 mm threaded stud and a single mounting hole with a 12.3 mm diameter. Rubber bushings are included to help absorb road vibrations and provide a smoother ride. The ball joint is bolt-in type, ensuring secure installation without the need for grease fittings. Mounting hardware is also provided for convenience.

Compatible Vehicles and Applications

This Dorman control arm and ball joint assembly is compatible with a range of vehicles, including Buick models like the Regal and Century, Chevrolet models such as the Blazer, Malibu, and Monte Carlo, GMC trucks like the Jimmy and Sonoma, as well as Isuzu Hombre and S15 models. It also fits Oldsmobile Cutlass and Pontiac Grand Prix vehicles. This part is ideal for light suspension grade applications where reliable control arm performance is required.

Common Issues Addressed by This Assembly

• Worn or damaged control arm bushings causing poor handling
• Loose or failing ball joints leading to steering instability
• Corroded or bent control arms affecting suspension alignment
• Excessive suspension noise or vibration
• Difficulty maintaining proper wheel alignment

Installation Notes and Tips

Installation of the Dorman 520-138 control arm and ball joint assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and the control arm is pre-greased, the assembly is ready for immediate installation. Ensure the mounting hole aligns correctly with the vehicle’s frame and torque all bolts to manufacturer specifications. This assembly is not adjustable, so proper fitment verification before installation is recommended.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 520-138 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 material and workmanship.