I have a problem with my F250 truck. It makes a grinding noise up front at around 70 mph. The noise goes away when climbing a hill. Only hear it at that speed or higher. Also my 4x4 won't lock in now. Thanks in advance for any help.

 

Welcome to the site..

What’s the year of your 250?

 

It's a 2005 F250 4x4 . It has a 9 inch lift on 37 Nittos. Engine is a V10. Thanks