2010 Arctic Cat DVX 300 / 300 Utility ATV Service Manual, Page 57Get this manual
9Install the lowreverse clutch dog and spacer washer; then install the reverse gear and reverse gear thrust washerAt this point, the driveshaft is ready for installation
12Install the high shift fork into the high clutch dog; then engage the shift fork pawl into the appropriate shift cam groove13Install the shift fork shaft making sure that the shift fork pawls remain engaged in the shift cam; then install the shift cam stopper ball, spring, sealwasher, and plugTighten to 20 ft-lb
10Apply clean engine oil to the assembled shafts and gears; then install the countershaft and driveshaft simultaneously into the transmission case