I get a "rumble" or vibration in my front end when I lock the hubs (in or out of 4x4). Not exactly sure how everything works up there, I'm still pretty new to this truck. I've seen in some posts that some drivability issues might be normal with the hubs locked, but I think this is maybe more than that. Any thoughts?

 

I had the same problem this year with mine. Turned out to be the axle u joints. They were completely seized up.

 

Sounds like time for some good greasable U joints.

 

Thanks, guys.