You want cheap articulation huh. Ive got bronco II springs in the rear and rears up front. If you are really cheap you can get shocks off of rigs in the yard. Basically all the parts you need are gonna be either at the junk yard or the metal recyclers. Its easy, very cheap, very effective. If you need pics, look in the projects section under Ive been busy. Most all the info you need is in there.
WT