I drive a 04' Chevy 2500HD I adjusted the fromt torsion bars to level out the truck and now when I tow it squats in the rear slightly so I thought to add an extra leaf spring, but I don't want to raise the rear more than an 1" or so. So my question is have any of you added a spring and how much did it raise it? The reason I ask my dad added it to a 2wd and it really looks badIt looks a good 4" higher and that I don't want.