Mevotech GS40178 Lateral Arm and Ball Joint Assembly - Rear

Rear Suspension Control Arm Assembly

Restore rear suspension geometry and handling with the Mevotech Original Grade GS40178 lateral arm and ball joint assembly. This steel, black-finished assembly is built as an exact-match replacement for regular commuter and routine driver use, with pre-greased, unitized ball joints and adjustable threaded stud design for service-friendly installation.

Compatible with 2003-2006 Ford Expedition rear and 2003-2006 Lincoln Navigator rear, this GS40178 control arm helps return OE ride quality and alignment performance. It is a direct-fit suspension replacement for rear lateral arm service on Ford Expedition and Lincoln Navigator applications.

Key Features

• Mevotech Original Grade GS40178 premium replacement part
• Steel construction with black finish
• Ball joint at both ends for rear suspension linkage
• Pre-greased unitized ball joints for ready-to-install service
• Adjustable threaded stud design
• Mounting hardware included where required
• Exact-match fit, form, and function for OE-style replacement

Detailed Description

The Mevotech GS40178 is a rear lateral arm and ball joint assembly engineered to replace the original suspension component on select Ford Expedition and Lincoln Navigator models. Built from steel and supplied with unitized ball joints, it is designed to restore rear suspension control, alignment stability, and consistent road feel. The adjustable design supports proper positioning during service, while the pre-greased construction helps simplify installation and initial operation. This part cross-references MOOG Chassis Products RK623432 for the same application.

Use the GS40178 when servicing rear suspension wear on 2003-2006 Ford Expedition and 2003-2006 Lincoln Navigator vehicles. The Mevotech GS40178 is a direct replacement for OE-style rear lateral arm service and is suited for drivers seeking a factory-matched suspension repair.

Common Issues This Part Can Address

• Rear suspension looseness or instability
• Clunking or knocking from worn lateral arm joints
• Uneven rear wheel alignment caused by worn suspension linkage
• Excessive play in the rear suspension assembly
• Restoring OE ride and handling characteristics

Installation Notes and Tips

Verify rear fitment by year, make, and model before installation. Because this assembly uses threaded stud mounting and an adjustable design, alignment inspection is recommended after replacement. Inspect adjacent rear suspension components for wear before completing the repair on Ford Expedition or Lincoln Navigator applications.

Quality Assurance

Mevotech Original Grade parts are built as OE-style replacements for fit, form, and function, with hardware included where required to help streamline installation. The GS40178 is intended to restore original suspension performance on supported rear applications.