Ford Repair Questions? Ask a Mechanic for Answers ASAP
The most common cause of this is the 4x4 vacuum solenoid goes bad. If these hubs do not have vacuum they try to lock in. If you have a leak or poor vacuum they will engage partially which causes the grind noise. Start by checking for a vacuum leak in the system if none replace that solenoid.
I hope my assistance helped you and resolved your concern, if you need further assistance please ask.
Please note, your Deposit doesn't constitute a payment. Please click the 'ACCEPT' button to allow me to receive credit for my work. Positive feedback and Bonuses are appreciated. Thank you, Shawn.