SHAFTS MOVE FREELY. 502S 502-S 162519. 8-254 2BBL CORE 502S NOTES. ANYTHING LISTED AS A CORE WILL NOT HAVE A FULL WARRANTY. INTERNAL PARTS OF A CORE ARE NOT COVERED UNDER THE WARRANTY. Axles Assemblies: Axle assemblies will not include any brake hardware: Calipers/Rotors/Shoes/Pads/Hoses/Brake Lines.