To raise the truck 3 inches, you will need a shackle that is 6 inches longer than stock.
This will change the pinion angle of the truck. it will throw your pinion downward, making the driveline angle worse.
Your caster will also be off on the truck making it not want to return to center when turning.
Just a dumb question!! Why not take the factory shackle off of the rear of the front spring and relocate the new longer shackle to the front near the bumper? Baisically turn the spring around. Yea I know that I aint no mechanic.
Do NOT put blocks in the front. The latteral forces on the front suspension while turning will make it spit those blocks out and youll end up killing yourself or someone else.
Moving the shackle to the front will not raise the suspension. (and makes for a harsher ride)
Edit: 1gunmutt I miss read your post. A longer shackle will raise the suspension but to get 3" it would still have to be 6" longer and it still screws with the pinion angle and caster angle unless you use degree shims. By the time your done fabbing the new spring mount on the rear of the front spring youd be better off just saving for a proper lift kit.
If your going to lift it 3" with shackles and blocks in the rear then you need new longer shocks and longer or modified brake lines as well.
Increasing castor would make the truck hard to turn, very easy to keep in a strait line.
If the shackle is in front of the axle it will cause major bump steer.
Sorry about previous post, didn't read till now it's a 1009....about the leaf spring thing, it will work...you just dont have to toss the bottom spring.
About the shackles, you can use a peice of 5/16" thick, 4"x4"x length boxed steel cut in half for heavy duty shackles,both sides for 1 truck. (length determines lift - 50%). Notch the steel for the frame. I'm doing it on a different truck this weekend, can post pictures. between the springs and shackels mentioned you could get 3" pretty easily at a cost of.....10.00 for steel, 3.00 each spring at a junk yard, 40.00 for new u-bolts, and 15.00 for pinion correction shims, 4 degree probably. under 125.00 gets the front and rear up SAFELY, and brake lines aren't usually an issue until 4"+. Get the rear blocks from a late 70's-early 80's ramcharger or other truck (dodge uses blocks in lots of applications).....