DRL42RLSHAFTS fits the front differential on the Ram Classic models built up to, and before MAR.14, 2021; Ram 2021 Trucks built after Mar.15, 2022 (Ram 2022 +) use new part # DRL424XRLCOMBO; High performance SKF, NTN, and INA bearings; Superior quality neoprene and nitrile sealing components; Zinc dust shield protective plates; Neoprene boots to protect splines; Complete technical drawings with detailed installation instructions to ensure a professional replacement