transfercase

Coulple of days ago I had a clunck as I was taking off and then shortly after that hi both 2 and 4 would not lock up. I am able to put it in 4 lo and it works great (how I got home). I disconnected the linkage and I am able to switch thru 2H, 4H, N, and 4L but in 2 or 4 H it grinds and does...