Moog RK620668 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper

OE-Style Rear Left Upper Control Arm

The Moog RK620668 is a rear left upper suspension control arm and ball joint assembly for select Ford, Lincoln, and Mercury applications. It is built with forged aluminum for structural strength and corrosion protection, and it comes pre-greased with bushings and mounting hardware included.

Compatible with 2002-2005 Ford Explorer, 2003-2005 Lincoln Aviator, and 2002-2005 Mercury Mountaineer in the rear left upper position, this assembly is a direct-fit suspension replacement for vehicles needing a precise OE-style control arm solution. The RK620668 is a practical choice when restoring rear suspension geometry and ride control on these platforms.

Key Features

• Forged aluminum control arm construction for strength and corrosion resistance
• Pre-greased for initial service readiness
• Rubber bushings included for suspension isolation
• Press-in ball joint mounting with threaded stud type
• Mounting hardware included
• Gray finish
• Non-adjustable design

Detailed Description

Moog RK620668 is engineered as a premium control arm assembly for foreign and domestic nameplates, with a focus on structural durability and corrosion protection. The forged aluminum arm helps maintain suspension integrity, while the included rubber bushings support controlled movement and help reduce harshness in the rear suspension. This part number, RK620668, is listed for the rear left upper position on the Ford Explorer, Lincoln Aviator, and Mercury Mountaineer applications shown below.

This part cross-references Dorman OE Solutions 521-381 for the same application. It also cross-references Mevotech Supreme CMS40126 for the same application.

What It Helps Address

• Excessive rear suspension play or looseness
• Clunking or knocking from worn control arm bushings
• Uneven rear suspension geometry after wear
• Ball joint wear at the rear left upper control arm location
• Corrosion-related replacement needs on the rear suspension

Installation Notes

• Fits 2002-2005 Ford Explorer, rear left upper.
• Fits 2003-2005 Lincoln Aviator, rear left upper.
• Fits 2002-2005 Mercury Mountaineer, rear left upper.
• Verify rear left upper application and suspension configuration before installation.
• Press-in ball joint design requires proper service tools and installation procedure.
• Confirm alignment after replacement to restore correct suspension settings.

Quality Assurance

Moog premium control arms are engineered for structural strength and corrosion protection, making the RK620668 a solid OE-style replacement for rear suspension service on the Ford Explorer, Lincoln Aviator, and Mercury Mountaineer platforms.