So you thought you could not replace the starter ring gear on your 2006 and Later Dyna, and 2007 and Later Twin Cam Evolution Industries has the solution for you with the Super 106 Tooth Ring Gear Kit. Made from aircraft quality 8620 steel. Entirely hardened by carburization followed by an oil bath, as apposed to water, quench. Black oxide finish. Includes a replacement starter clutch and pinion gear assembly