I recently bought a used 2012 dodge ram slt 4x4 I got it for cheap because the box and to be replaced and a small part of the frame had to be replaced, once I got it back I drove it around for a couple hours and then the next day I drove it again and it was fine until I heard something like clicking, it sound like something hitting up against my tires because as I accelerated the clicking rate increased. then as I was turning my back right tire locked up so I got out looked around the tire and I couldn't see anything too obvious, I then got back it the truck and switched into reverse and then it drove fine in reverse and then I put it back into drive and it drove fine, but I didn't dare drive it anymore than I had to to get it back to my house, the 4WD service light came on, and I was wondering if anyone had a good idea of what happened. also, the is a tube hanging loosely by my differential, to me, it looks like some kind of breather tube because the other end has a plastic piece in the end of it. If anyone has any suggestions that would be great, thanks.