Primary shaft Pinions (4-speed gearbox) | Drive shaft. | Dog nut. | Primary shaft 18 x 13 x 12 tc :eth. | Support tube joint. | Oil return flange. | Support tube. | Shaft spring. | Idler pinion (3rd) 29 teeth | 23 teeth | Pinion (4th) 27 teeth. | 28 teeth. | Synchro (3rd and 4th). | Synchro-ring (3rd and 4tl | &clip. | Setting pin. | Ball spring.