Dorman 520-975 Suspension Control Arm and Ball Joint Assembly - Rear Upper Forward

Durable Suspension Control Arm and Ball Joint Assembly for BMW Models

The Dorman 520-975 suspension control arm and ball joint assembly is engineered to restore precise handling and suspension performance for select BMW vehicles. Designed specifically for models such as the 525i, 528i, 530i, 540i, 740i, 740iL, 750iL, and M5, this assembly offers a reliable replacement option that meets regular suspension grade requirements.

• Pre-greased for immediate installation and smooth operation
• Includes rubber bushings and mounting hardware for a complete setup
• Constructed from durable steel with a black finish for corrosion resistance
• Ball joint installed with a pinch bolt stud type for secure attachment
• Compatible with BMW 525i, 528i, 530i, 540i, 740i, 740iL, 750iL, and M5 models
• Part number 520-975 ensures exact fit and function

Product Features and Specifications

This suspension control arm assembly features a casting/forged steel control arm with a maximum width of 288.5 mm and length of 237 mm, designed to meet the demands of light suspension grade applications. The assembly comes pre-greased, eliminating the need for additional lubrication during installation. Rubber bushings are included to absorb vibrations and reduce noise, while the pressed attachment type ensures a secure fit. The ball joint is factory-installed and features a 14 mm thread diameter with a pinch bolt stud type, providing reliable steering and suspension articulation. One mounting hole with a diameter of 12.3 mm is included, along with all necessary mounting hardware for straightforward replacement.

Compatible BMW Models and Applications

This Dorman 520-975 suspension control arm and ball joint assembly is compatible with a range of BMW vehicles, including the 525i, 528i, 530i, 540i, 740i, 740iL, 750iL, and M5. It is designed to restore factory suspension geometry and improve vehicle stability, making it suitable for owners seeking a direct replacement part that meets OEM specifications.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing excessive play
• Faulty ball joints leading to uneven tire wear or steering issues
• Corroded or bent control arms affecting alignment and handling
• Suspension noise or vibrations due to degraded components
• Reduced vehicle stability and control during cornering

Installation Notes and Tips

Installation of the Dorman 520-975 assembly requires basic suspension knowledge and tools. Since the part comes pre-greased and includes mounting hardware, it simplifies the replacement process. Ensure the vehicle is securely lifted and supported before removing the old control arm. Verify that the mounting hole aligns correctly and torque all fasteners to manufacturer specifications. An alignment check is recommended after installation to maintain proper suspension geometry.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed industry standards for durability and performance. The 520-975 control arm and ball joint assembly undergoes rigorous quality control to ensure fitment and function. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship, providing confidence in the product's reliability.