7L1Z-9H465-B 4x4 Vacuum Solenoid Valve and FL3Z-3A788-B Auto-Locking Hub Vacuum Line Tube Check Valve Combo Kit Fit for Ford F150 Expedition Lincoln Navigator

The locking hubs trying to engage. It’s a very cheap fix. https://a.co/d/08IpPNIl. It’s a $31 part on Amazon. It’s a bad vacuum line or the solenoid. I had that exact noise driving cross country. Figured I’d give this a try before taking it somewhere. That link is for both parts. I have not had any issues for 2 years. The part is located drivers side under the hood. Next to the brake master cylinder.