A slow speed, high torque shear technology is disclosed having optional configurations and attachments for its construction and methods for reconfiguring existing shears to improve performance, and maintenance economics. A method is provided for the readily replacement of individual cutters and tooth modules, reconfiguration of cutter and tooth assemblies in a mix and match manner, in combination with matching anvils having replacement cutting elements with multiple cutting faces. Alternative embodiments are provided illustrating methods of configuration of various types of cutting elements and material feed systems. Methods for converting a rough cut shear to a fine particle shear and then to a granulator as well as a method for rejecting unprocessable material is also disclosed.