Dorman 521-903 Suspension Control Arm and Ball Joint Assembly - Front Left Lower

Reliable Suspension Control Arm and Ball Joint Assembly

The Dorman 521-903 suspension control arm and ball joint assembly is designed to restore proper suspension function for vehicles requiring a light suspension grade component. Engineered with durable steel and pre-greased ball joints, this assembly offers a dependable solution for maintaining vehicle stability and handling.

• Pre-greased ball joint for immediate use
• Includes rubber bushings and mounting hardware
• Steel control arm with casting/forged construction
• Bolt-in ball joint with pinch stud type
• Control arm dimensions: 288.5 mm width, 237 mm length
• Single mounting hole with 12.3 mm diameter
• Black finish for corrosion resistance

Durable Construction and Design Features

This Dorman suspension control arm and ball joint assembly (part number 521-903) features a steel control arm built with casting and forging techniques to ensure strength and longevity. The assembly comes pre-greased, eliminating the need for immediate maintenance after installation. Rubber bushings are included to absorb vibrations and reduce noise, while the bolt-in ball joint with a pinch stud design provides secure attachment and reliable steering response. The black finish helps protect against corrosion, extending the service life of the component.

Compatible Vehicles and Applications

This control arm and ball joint assembly is suitable for light suspension grade applications and is compatible with various vehicle makes and models requiring a 14 mm ball joint thread diameter and a single mounting hole of 12.3 mm. It is ideal for vehicles that need a direct replacement part to restore suspension geometry and handling performance. Always verify fitment with your specific vehicle model and year before purchase.

Common Suspension Issues Addressed

• Excessive play or looseness in the suspension control arm
• Worn or damaged ball joints causing steering instability
• Noise or vibration from deteriorated bushings
• Misalignment leading to uneven tire wear
• Corrosion or damage to original control arm components

Installation Notes and Tips

Installation of the Dorman 521-903 control arm and ball joint assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and pre-greased, no additional lubrication is necessary during installation. Ensure all mounting hardware is securely tightened to manufacturer torque specifications. It is recommended to perform a wheel alignment after installation to maintain proper suspension geometry and vehicle handling.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, providing reliable performance and durability. The 521-903 suspension control arm and ball joint assembly undergoes rigorous quality control to ensure fit and function. Please refer to Dorman's warranty policy for specific coverage details.