#30375 TC JACKSHAFT, FITS 70-75, reproduction.This is the updated jackshaft, which is threaded on both ends. On 1970 & early 1971 models the jackshaft was only threaded on the TC end and the sprocket was pinned on. You can use this jackshaft if you use a keyed sprocket like our replacement #30371. You will also need to purchase 1 or 2 jackshaft washers #30343 to space this sprocket out to the same distance as an original Rupp sprocket.