Call Calvert and talk to Travis or John. Order the split mono springs with a 1.5" drop,locating pin moved 3/4" rearward and ask for all solid bushings. Run sliders instead of shackles in the rear and a good double adjustable afco shock. That will complete your rear suspension and be the best possible setup to run for your application and the rearward locating pin will allow you to go up in tire size (diameter) later if you choose to do so.