Re: shackle flip
The front hanger on a half ton truck is considerably taller than any other front hanger found on K5s, 3/4 tons, or 1 tons. With a shackle flip the spring eyes are nearly level.
Heavy 3/4 ton or 1 ton hangers are about the right height to do a shackle flip in the back. I used the hangers out of my 77C20 which had 9 leaves in the pack.
I can get you pictures when I go home next weekend. I'm at my parents' right now and 28.8 dialup on a P200 using Win98 blows donkeys.