Dorman 521-959 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper

Dorman 521-959 Rear Left Upper Control Arm

Dorman 521-959 is a direct replacement suspension control arm and ball joint assembly for specific Ford Escape, Mazda Tribute, and Mercury Mariner applications. It is built to restore smooth ride quality, directional stability, and predictable suspension movement in the rear left upper position.

Key Features

• Direct replacement for the original equipment control arm and ball joint assembly
• Pre-greased with a grease fitting included for serviceability
• Steel stamped control arm with rubber bushings
• Ball joint is installed and uses a press-in mounting design
• Includes mounting hardware
• Black finish for OE-style appearance
• Light suspension grade construction for the specified applications

Detailed Product Overview

This Dorman suspension control arm and ball joint assembly is engineered for the rear left upper position on 2009-2012 Ford Escape, 2009-2011 Mazda Tribute, and 2009-2011 Mercury Mariner models. The stamped steel arm, rubber bushings, and installed ball joint are selected to match the original suspension layout and support consistent handling characteristics. Dorman 521-959 is a practical OE-style replacement when the original arm shows wear at the bushings or ball joint. This part cross-references MOOG Chassis Products RK621456 for the same application.

What It Helps Address

• Clunking or looseness from a worn rear upper control arm
• Uneven rear suspension movement caused by deteriorated bushings
• Directional instability from ball joint wear
• Suspension noise during bumps or lane changes
• Restoring OE-style rear suspension geometry on Ford Escape, Mazda Tribute, and Mercury Mariner models

Installation Notes and Tips

Verify the rear left upper position before installation and confirm vehicle application by year, make, and model. The ball joint uses a press-in mounting type and the stud is threaded, so proper suspension service tools and torque procedures are important. Inspect adjacent rear suspension components for wear before completing the repair. Dorman 521-959 is listed for 2009-2012 Ford Escape, 2009-2011 Mazda Tribute, and 2009-2011 Mercury Mariner in the rear left upper location.

Quality Assurance

Dorman uses an industry-focused evaluation process to help ensure the assembly delivers stable handling, smooth ride quality, and predictable suspension response in the specified applications.