Dorman 521-421 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper or Rear Right Upper

Reliable Suspension Control Arm and Ball Joint Assembly

The Dorman 521-421 suspension control arm and ball joint assembly is engineered for Ford Escape, Mazda Tribute, and Mercury Mariner models. Designed to restore precise steering and suspension performance, this assembly comes pre-greased and ready for installation.

• Pre-greased for immediate use without additional lubrication
• Includes rubber bushings for effective vibration dampening
• Machined ball joint mounting with threaded stud for secure fit
• Constructed from durable stamped steel with a black finish
• Compatible with Ford Escape, Mazda Tribute, and Mercury Mariner
• Mounting hardware included for straightforward installation

Durable Construction and Design Features

This suspension control arm and ball joint assembly features a stamped steel control arm designed for light suspension grade applications. The black finish provides corrosion resistance, while the included rubber bushings help absorb road shocks and reduce noise. The ball joint is machined and installed with a threaded stud, ensuring a precise and secure connection to the vehicle’s suspension system. With a control arm maximum width of 288.5 mm and length of 237 mm, this assembly fits the specified vehicle models accurately. The assembly is pre-greased, eliminating the need for immediate maintenance after installation.

Compatible Vehicles and Applications

This Dorman 521-421 assembly is compatible with the following vehicles:

• Ford Escape
• Mazda Tribute
• Mercury Mariner

It is designed to replace worn or damaged suspension control arms and ball joints, restoring proper alignment and handling characteristics.

Common Suspension Issues Addressed

• Excessive play or looseness in the suspension control arm
• Unusual noises such as clunking or squeaking during driving
• Uneven tire wear caused by misalignment
• Reduced steering responsiveness or stability
• Vibration or harshness felt through the steering wheel

Installation Notes and Tips

Installation of the Dorman 521-421 suspension control arm and ball joint assembly requires basic suspension knowledge and tools. Since the assembly comes pre-greased and includes bushings and mounting hardware, it is ready for direct installation. Ensure the vehicle is securely lifted and supported before beginning work. Torque all fasteners to manufacturer specifications and verify proper alignment after installation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 521-421 suspension control arm and ball joint assembly undergoes rigorous quality control to ensure durability and performance. Please refer to Dorman’s warranty policy for specific coverage details.