Moog RK621801 Suspension Control Arm and Ball Joint Assembly - Rear Upper Rearward

Rear Upper Rearward Control Arm for Expedition and Navigator

The Moog RK621801 is a suspension control arm and ball joint assembly for the rear upper rearward position on select Ford Expedition and Lincoln Navigator models. Built with forged steel construction, a pre-greased design, and rubber bushings, it is made for structural strength and corrosion resistance in demanding suspension service.

Key Features

• Fits 2007-2008 Ford Expedition, rear upper rearward
• Fits 2007-2008 Lincoln Navigator, rear upper rearward
• Forged steel control arm for added structural durability
• Pre-greased assembly for ready-to-install service
• Rubber bushings included for suspension isolation
• Press-in ball joint with threaded stud type
• Mounting hardware included
• Black finish for a clean OE-style appearance

Detailed Description

Moog RK621801 is engineered as a direct replacement suspension control arm and ball joint assembly for the rear upper rearward location on 2007-2008 Ford Expedition and 2007-2008 Lincoln Navigator models. The forged steel arm provides the strength needed for suspension loads, while the rubber bushings help isolate road vibration and maintain controlled rear suspension movement. This assembly is pre-greased and includes the ball joint and bushings already integrated for service efficiency. This part cross-references Dorman OE Solutions 523-013 for the same application. The Moog RK621801 part number is also commonly searched by buyers looking for a rear upper rearward control arm for Expedition and Navigator suspension repair.

Common Repair Uses

• Restoring rear suspension geometry after worn control arm wear
• Addressing clunking or looseness from deteriorated bushings
• Replacing a worn or damaged rear upper rearward ball joint assembly
• Correcting rear-end instability or uneven suspension response
• Repairing corrosion-related suspension component failure

Installation Notes and Tips

Verify vehicle year, make, model, and rear upper rearward position before installation. Because the ball joint is press-in and the stud is threaded, proper suspension service tools and torque procedures are important for correct fitment. Inspect adjacent rear suspension components, alignment-related hardware, and mounting points during replacement to help ensure a complete repair. The Moog RK621801 is a direct-fit service part for the listed applications, including Ford Expedition and Lincoln Navigator rear suspension repair.

Quality Assurance

Moog premium control arms are engineered for structural strength and corrosion protection on foreign and domestic nameplates. RK621801 is built to meet OEM standards for the listed applications and is backed by Moog’s reputation for suspension component engineering.