I have a 2005 4x4 Silverado 2500 HD, dropped it 2 inches. Turned Torsion bar keys down, 2' drop shackles in the rear. Cutting leaf hangers soon (fixing pinion angle).. Doing drop spindles front and taking a leaf or two out, deciding what to do rear, have air bags to give back payload capacity. Love the Fab work you've done.. !