RMS sells a nice spring relocation kit too. Reasonable price too.
Basically you are moving the springs into the frame. You have to cut a section out and weld a spring box in. Also have to move the spring perched on the rear in some also. To get the most out of that though you need to mini tub.
They make a kit to move the springs in like 3/4 of inch. May just have to move the spring perches and no other welding. May be able to just drill new holes in the perch too but not 100% sure on that.
