Part # 98-570 pinion shaft conversion kit is for installation of multiple piece aftermarket flywheels in 1990-1999 engines or replacement of 1990 and later assembly with stock 1981-1989 parts. Kit includes 1977-89 red pinion gear, 1954-89 pinion shaft oil pump drive gear, 1954-89 pinion shaft gear spacer, 1954-89 pinion shaft gear nut & 2 woodruff keys (not pictured). Sold as: KIT