Dorman 600-402 4WD Hub Locking Solenoid

4WD Hub Locking Solenoid for Ford Super Duty

This Dorman 4WD hub locking solenoid is a direct replacement for the original equipment unit on select vacuum-activated Ford trucks and SUVs. It restores vacuum control to the front hub locking system for 1999-2010 Ford F-250 Super Duty, 1999-2010 Ford F-350 Super Duty, and 2000-2005 Ford Excursion applications.

• Direct replacement for the OE 4WD hub locking solenoid
• Blade terminals with 3-terminal electrical connection
• Metal and plastic housing construction
• Includes 4WD vacuum actuator
• Wiring harness not included

Detailed Product Overview

Built for vacuum-activated front hub systems, Dorman part number 600-402 helps restore proper engagement and disengagement of the 4WD hub locking mechanism. The unit is engineered to replace the original solenoid on select Ford F-250 Super Duty, Ford F-350 Super Duty, and Ford Excursion models, making it a practical OE-style solution for driveline service. This part cross-references Ford 7C3Z9H465A and J78001 for the same application.

Common Problems This Part Can Address

• Front hubs that do not lock or unlock correctly in 4WD operation
• Vacuum control loss at the hub locking system
• Intermittent four-wheel-drive engagement on vacuum-activated setups
• Fault codes or drivability concerns tied to hub actuator control
• Replacement needs after solenoid housing or internal component wear

Installation Notes and Tips

Verify the vehicle uses a vacuum-activated hub system before ordering. Match the 3-terminal blade connector and confirm the mounting location and vacuum routing against the original part. Dorman 600-402 is intended as a direct replacement, but the wiring harness is not included, so reuse the existing harness if serviceable.

Quality Assurance

Dorman manufactures replacement components to match original equipment fit and function on listed applications. Part number 600-402 is built for direct OE-style service on compatible Ford Super Duty and Excursion models.