Not that major an operation to make some lowering blocks. Retains most of your ride. Some 2 1/2 inch wide heavy wall tubing the Height of which would be the distance that you want to drop the rear. 2 pieces about 6" long and drill press. Drill out one side a hole the diameter of the spring tie bolt head to sit in and drill a 5/16 inch hole directly opposite to install a short spring eye bolt to fit in the centering hole in the spring perch.