I have a np 208 in my 82 Blazer. It's leaking like a siv.. are they easy to dismantle and reseal? How complex is it to take one of these down? I have the chilton's manual, but it show's internal parts pictures. Anyone have experience? Or should I just find a newer xfer case.. if i'm not mistaken.. aren't the 208's cast iron which should make them bulletproof? Thanks ..