Hey all, I'm new here, was hoping for advice, my 2000 Silverado 2500 4x4 is having issues and I can't seem to get any answers from any other mechanics, when engaged n 4x4 it sounds as if front end is n a bind, replaced back tires to match front, replaced u joints, New transfer case, New ball joints, and I have to have my 4 wheel drive to get out of my driveway this season, luckily it's not for very long, just to back up about 10 feet each morning, but now I'm getting a rattle and a knocking sound as well but that is all the time

 

O it's got a 6.0 n it, auto