Dorman 521-640 Suspension Control Arm and Ball Joint Assembly - Front Right Lower

Durable Suspension Control Arm and Ball Joint Assembly

The Dorman 521-640 suspension control arm and ball joint assembly is engineered for reliable performance in select GM vehicles. Designed specifically for Buick, Chevrolet, Pontiac, and Saturn models, this assembly ensures proper suspension function and vehicle stability.

• Pre-greased for immediate use and reduced maintenance
• Includes rubber bushings for vibration dampening
• Steel boxed control arm construction for strength and durability
• Bolt-in ball joint with threaded stud for secure mounting
• Compatible with Buick Aztek, Chevrolet Montana, Relay, Rendezvous, Terraza, and Saturn Uplander

Product Features and Specifications

This suspension control arm and ball joint assembly features a boxed steel control arm finished in black for corrosion resistance. The assembly comes pre-greased, eliminating the need for initial lubrication, and includes rubber bushings to absorb road shocks and reduce noise. The ball joint is installed and ready to bolt in, featuring a threaded stud with a 14 mm thread diameter for a secure fit. The control arm measures up to 288.5 mm in width and 237 mm in length, with a single 12.3 mm mounting hole. This light suspension grade component is designed for regular use and is not adjustable.

Compatible Vehicles and Applications

This Dorman 521-640 assembly is compatible with the following vehicles:

• Buick Aztek
• Chevrolet Montana, Relay, Uplander
• Pontiac Rendezvous
• Saturn Terraza

It is intended to replace worn or damaged suspension control arms and ball joints, restoring proper steering and suspension geometry.

Common Issues Addressed

• Excessive suspension noise or clunking
• Uneven tire wear due to misalignment
• Loose or unstable steering feel
• Vibration or harshness over bumps
• Worn or damaged ball joints or bushings

Installation Notes and Tips

Installation requires removal of the existing control arm and ball joint assembly. The bolt-in ball joint with threaded stud simplifies mounting, but proper torque specifications should be followed to ensure safety and performance. Since the assembly is pre-greased and includes bushings, no additional lubrication is necessary during installation. Verify compatibility with your specific vehicle model and year before installation.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for fit and function. The 521-640 control arm and ball joint assembly undergoes quality inspections to ensure durability and reliability. Please refer to Dorman's warranty policy for coverage details.