Warrior Lift Shackles
Shackles are used to connect your leaf springs to the frame of your vehicle and allow the spring to move back and forth during the suspension cycle. One side of the shackle bolts to the frame and the other side connects to the eye of your spring by way of the spring eye bolt. One of the easiest and least expensive ways to get a little extra height out of your truck is to replace your stock shackles with lifted shackles.
Greasable shackles are a great way to go because they allow you to lubricate between the polyurethane bushing and bolt which diminishes friction and noise.