Quote Originally Posted by KongGMC View Post
I hate to sound ignorant but I am. What are shackles and how do they work?

Also, I was told putting a good anti-sway bar on the rear would help it enormously as well. Thoughts on that?
Your answer lies at google.com. If you look under the rear of your truck it is the metal bracket attached to the rear of your leaf springs then attaches to your frame. take a look and then you'll understand.