When the solenoid that engages your locking hubs stops responding, the Dorman 4WD hub locking solenoid, part number 600-402, is built to directly replace the original equipment solenoid. It fits many vehicles, among them the 1999-2010 Ford F-250 Super Duty, 1999-2010 Ford F-350 Super Duty and 1999-2010 Ford F-450 Super Duty. See the "Vehicles it fits" section for the full list and engine details.
Dorman OE Solutions lists this part under two names, 4WD Hub Locking Solenoid / 4WD Differential Switch, so you may see either one used for the same unit. It helps engage and disengage the locking hubs when four-wheel drive is selected or switched off.
- Direct replacement: Designed to match the original solenoid's fit and function on the listed applications.
- Replaces a failed original: If a failed factory solenoid is why your 4WD system won't respond, this unit replaces it.
- Thoroughly tested: Validated through both on-vehicle and laboratory testing.
- Engineering support: Backed by a U.S.-based team of designers and engineers.
Signs this part may need replacing include four-wheel drive that won't engage or disengage, and locking hubs that stay locked or stay unlocked. Wiring, switches and hub components can cause similar symptoms, so diagnose the 4WD system before replacing the solenoid.
Interchange: 7C3Z9H465A · F81A9H465BA · F81Z9H465BA · J78001
This part cross-references / interchanges with the following part numbers:
7C3Z9H465A, F81A9H465BA, F81Z9H465BA, J78001
Frequently Asked Questions
What does the Dorman 600-402 do?
It is a 4WD Hub Locking Solenoid / 4WD Differential Switch that helps engage and disengage the locking hubs when four-wheel drive is selected or switched off.
Will it fit my 1999-2010 Ford F-250 Super Duty?
Yes. The 1999-2010 Ford F-250 Super Duty is a listed application. Check the "Vehicles it fits" section for the other listed vehicles and engine details.
Is this a direct replacement for the original solenoid?
Yes. Dorman designed it to directly replace the original equipment solenoid on the listed applications.
What are signs a 4WD hub locking solenoid may need replacing?
Signs include 4WD that won't engage or disengage and hubs that stay locked or unlocked. Wiring, switches or hub parts can cause the same symptoms, so diagnose the system first.
How was this solenoid tested?
Dorman put it through both on-vehicle and laboratory testing, and it is backed by a U.S.-based team of designers and engineers.
