Dorman 520-981 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Rearward

Durable Suspension Control Arm and Ball Joint Assembly for BMW 740i Series

The Dorman 520-981 suspension control arm and ball joint assembly is engineered to restore precise steering and suspension performance for BMW 740i, 740iL, and 750iL models. Designed with quality materials and pre-installed components, this assembly offers a reliable replacement option for light suspension grade applications.

• Pre-greased ball joint for immediate use
• Includes rubber bushings and mounting hardware
• Iron control arm with casting/forged construction
• Press-in ball joint with threaded stud (14 mm thread diameter)
• Compatible with BMW 740i, 740iL, and 750iL models

Product Features and Specifications

The Dorman 520-981 control arm assembly features a robust iron control arm finished in black for corrosion resistance. It includes rubber bushings to absorb road vibrations and reduce noise, enhancing ride comfort. The ball joint is press-in mounted and comes pre-installed with a threaded stud, eliminating the need for additional assembly. This assembly is designed for light suspension grade use and includes one mounting hole with a diameter of 12.3 mm. The control arm measures up to 288.5 mm in width and 237 mm in length, ensuring proper fitment and alignment for the specified BMW models.

Compatible BMW Models and Applications

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

• BMW 740i
• BMW 740iL
• BMW 750iL

It is specifically designed to meet the suspension requirements of these models, providing a direct replacement for worn or damaged control arms and ball joints.

Common Suspension Issues Addressed

• Excessive play or looseness in steering
• Uneven tire wear due to misalignment
• Clunking or knocking noises over bumps
• Vibration or instability during driving
• Worn or damaged bushings causing poor handling

Installation Notes and Tips

Installation of the Dorman 520-981 assembly requires basic suspension knowledge and tools. Since the ball joint is pre-greased and installed, no additional lubrication is necessary. Ensure the mounting hardware included is used to secure the control arm properly. Verify torque specifications according to BMW service guidelines. This assembly is not adjustable, so alignment should be checked and corrected after installation.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards. The 520-981 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. Consult product documentation for exact warranty terms.