My old 70 GMC 1/2 ton 4x4 is beating the crap out of me! Does anybody know where to get and what kind of spring to get that would be a bit more forgiving? Do I need longer springs? If I put the longer springs on then I would also have to relocate the shackles as well right? I already installed a shackle flip and will need to get new 4" springs for the front anyway. Thanks for any info and suggestions.