I'm trying to see if it will fit my model online but I can't find anything :/Cheapest, is add-a-leaf which are around $30. The model number you are looking for is pro comp AAL 13120. Here's my thread on it : http://www.355nation.net/forum/lifting/128250-add-leaf-advice.html
Wish I would have gone this route instead of AAL. Oh well, I like my AAL's.That's about right. Our stock leafs are so shitty when I pulled mine off I could move them by hand. With half ton springs you get better load rating and about 2" of lift. Won't have to worry about then turning into W springs which eventually happens to all our trucks. Shackles give you lift but will also make make your leafs sag.
This is true, I faced this when I did my shackles. I had to cut the rubber bushing out of my rear eyelet with a blowtorch. One day of work, but definitely would have rather just done the AAL'sJust a thought, but living up north your leaf spring/shackle bolts will probably be rusted/frozen in place. It is possible to do the AAL with the springs still on the truck, thus eliminating 2 days work and saving you money since you won't have to worry about replacing leaf spring bushings and bolts.
For trucks up north like mine, you may not be able to get the center bolt out. If you cant, grind the head off and pound the new bolt down onto the center bolt. This will push the old out and the new one will slide in. Grind off the excess bolt and you're done.You can do them with the leafs on the truck. Just undo your shocks and ubolts. Jack the truck up off the axle. Put a c clamp around the leaf a few inches away from the center bolt and take the bolt out. Ease off the c clamp. Put the clamp back on with the AAL in place and suck everything together. Install the new center bolt and then reverse the order.