2013-2018 Ram 3500 4x4 Diesel Alas Full Progressive Leaf Spring Kit - 1" Lift (CS-DFSP-13-D-ALAS)Description Carli has teamed up with Deaver Spring to bring you an upgraded leaf spring package that lifts the rear 1" (14 18 or 2" 19+) while drastically improving unloaded ride quality without compromising your payload capacity. These progressive springs alter the rear position sensor to ensure the air bags are deflated at the new ride height, which creates an increase in up travel before the bags engage, providing you with a smoother ride (less air