2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 94Get this manual
CAUTION It is very important to assure the oil feed hole in the bushing and oil supply hole in the driveshaft alignIf not aligned, engine damage will result
7Install the 4th driven gear onto the driveshaft making sure the four small dogs are facing toward the 3rd driven gear as noted in disassembling