Moog RK621664 Suspension Control Arm and Ball Joint Assembly - Rear Left Lower

Rear Left Lower Control Arm for Escape and Mariner

Moog RK621664 is a rear left lower suspension control arm and ball joint assembly for select Ford Escape and Mercury Mariner applications. It is built with stamped steel construction, a press-in ball joint, and rubber bushings to support stable rear suspension geometry and consistent road feel.

Compatible With 2009-2012 Ford Escape, rear left lower, and 2009-2011 Mercury Mariner, rear left lower. This Moog control arm is pre-greased, includes a grease fitting, and comes with mounting hardware for service replacement on standard-design vehicles.

Key Features

• Moog RK621664 rear left lower control arm and ball joint assembly
• Stamped steel control arm with black corrosion-resistant finish
• Press-in ball joint with threaded stud type
• Pre-greased with grease fitting included for serviceability
• Rubber bushings included for OE-style suspension isolation
• Mounting hardware included
• Non-adjustable design for direct replacement use

Detailed Product Overview

Moog premium control arms are engineered for structural strength and corrosion protection, making RK621664 a practical replacement for worn rear suspension components. The stamped steel arm helps maintain rigidity, while the rubber bushings support controlled movement and reduce harshness in the rear suspension. For Ford Escape and Mercury Mariner owners, this part number RK621664 addresses the rear left lower position with a direct-fit design for standard applications.

This part cross-references Dorman OE Solutions 522-319 for the same application.

Common Problems This Part Can Address

• Rear suspension clunking from worn bushings or ball joint wear
• Uneven rear tire wear caused by loose suspension geometry
• Excessive rear-end movement over bumps and road joints
• Steering or handling instability related to rear suspension looseness
• Corrosion-related failure of the original control arm assembly

Installation Notes and Tips

Verify vehicle fitment by year, make, model, and rear left lower position before installation. Because the ball joint is press-in, proper service tools are required for installation and alignment checks should be performed after replacement. Confirm the vehicle uses the standard design noted in the fitment data for Ford Escape and Mercury Mariner applications.

Quality Assurance

Moog positions this control arm line for structural durability and corrosion protection in foreign and domestic applications. RK621664 is built as a service replacement part for the listed Ford Escape and Mercury Mariner fitments.