Moog RK621456 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper

OE-Style Rear Left Upper Control Arm

Moog RK621456 is a suspension control arm and ball joint assembly for select Ford Escape and Mercury Mariner applications. It is built with stamped steel construction, rubber bushings, and a pre-greased design to support consistent rear suspension movement and corrosion resistance.

Fits 2009-2012 Ford Escape, rear left upper. Fits 2009-2011 Mercury Mariner, rear left upper. This part cross-references Dorman OE Solutions 521-959 for the same application.

Key Features

• Stamped steel control arm for structural strength
• Pre-greased assembly for ready-to-install service
• Rubber bushings included for rear suspension isolation
• Press-in ball joint mounting with threaded stud type
• Mounting hardware included
• Black corrosion-resistant finish
• Non-adjustable design for standard OE replacement use

Product Details

Moog RK621456 is engineered as a premium replacement for the rear left upper suspension position on the Ford Escape and Mercury Mariner. The stamped steel arm, rubber bushings, and press-in ball joint design support proper suspension geometry and stable rear wheel control. With pre-greased components and included mounting hardware, this assembly is built for direct service on vehicles that need a dependable OE-style replacement. The RK621456 part number is also commonly searched by buyers comparing suspension control arm and ball joint assembly options for these vehicles.

Common Repair Symptoms

• Rear suspension clunking or knocking over bumps
• Excessive play in the rear upper control arm area
• Uneven tire wear related to worn suspension joints
• Loose or unstable rear-end handling
• Visible bushing wear, cracking, or separation

Installation Notes

Verify vehicle year, make, model, and rear left upper position before ordering. This assembly uses a press-in ball joint and threaded stud type, so proper suspension service tools and alignment procedures are recommended after installation. Confirm all mounting points are clean and inspect adjacent rear suspension components for wear before reassembly. RK621456 is a direct-fit style replacement for the listed Ford Escape and Mercury Mariner applications.

Quality Assurance

Moog premium control arms are engineered for structural strength and corrosion protection on foreign and domestic nameplates. RK621456 follows that product approach with durable materials and OE-style construction for the specified fitments. The RK621456 part number is a reliable reference when sourcing a rear left upper control arm for these applications.