Dorman 520-740 Suspension Control Arm and Ball Joint Assembly - Front Right Lower

Overview of Dorman Suspension Control Arm and Ball Joint Assembly

The Dorman 520-740 suspension control arm and ball joint assembly is designed for select BMW models, including the 318i, 318is, 318ti, 320i, 323i, 323is, 325i, 325is, 328i, 328is, and Z3. This assembly combines a durable iron control arm with a pre-installed ball joint to provide reliable suspension performance.

• Pre-greased ball joint for immediate use
• Iron control arm with casting/forged construction
• Includes mounting hardware for straightforward installation
• Press-in ball joint with threaded stud (14 mm thread diameter)
• Compatible with light suspension grade applications
• Black finish control arm measuring up to 288.5 mm width and 237 mm length
• Single mounting hole with 12.3 mm diameter

Detailed Product Description

The Dorman 520-740 suspension control arm and ball joint assembly is engineered to meet the suspension needs of various BMW models such as the 318i and 328is. Constructed from iron with a casting and forging process, this control arm offers structural integrity suitable for light suspension grade applications. The ball joint is press-in mounted and comes pre-greased, eliminating the need for additional lubrication during installation. The threaded ball joint stud ensures secure attachment, while the included mounting hardware simplifies the replacement process. This assembly does not include bushings, focusing on the core components necessary for suspension control and steering precision.

Compatible BMW Models and Applications

• BMW 318i, 318is, 318ti
• BMW 320i
• BMW 323i, 323is
• BMW 325i, 325is
• BMW 328i, 328is
• BMW Z3

Common Suspension Issues Addressed

• Worn or damaged control arms causing poor handling
• Ball joint wear leading to steering play or noise
• Corroded or weakened suspension components
• Uneven tire wear due to suspension misalignment
• Vibration or clunking noises from front suspension

Installation Notes and Tips

Installation of the Dorman 520-740 assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and pre-greased, no additional lubrication is necessary. Ensure the mounting hole aligns properly with the vehicle’s frame using the included hardware. The control arm is not adjustable, so proper alignment should be verified after installation. It is recommended to inspect related suspension components during replacement to maintain overall system integrity.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. The 520-740 suspension control arm and ball joint assembly undergoes quality checks to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Consult product documentation for exact warranty terms.