http://www.ironrockoffroad.com/10456.html

I have terrible shackle angle on my jeep which causes a terrible ride. I have considered doing the whole new hd shackle kit but also considered just buying a new shackle for little to no lift. I am fine getting an extra 1" of lift but would something like this also help fix my shackle angle?

 

Take a picture of your shackles.

 

I will try to in the morning. They are a little forwards of straight up and down. Its a pretty bad angle.

 

A longer shackle will do nothing to help the angle. You need shackle relocators

 

x2. Shackle relocation brackets is the way to go

 

If the new shackles are the same length, the angle (of the shackle's relation to the spring) will remain unchanged.
If the new shackles are longer, the new angle will be more oblique.
If the new shackles are shorter, the new angle will be more acute.

It's a triangle - there are 3 points: Front of the leaf spring that connects to the body, rear of the leaf spring that connects to the bottom of the shackle, and top of the shackle that connects to the body.
The shackle is the only side of the triangle for which you can change the length, unless you get longer/shorter springs, or a relocation bracket (which basically changes the length of the body-side of the triangle).

 

that's the best description regarding shackle angle I ever seen here on the forum.