2009 Arctic Cat 400/500/550/700/550/700/1000 ATV Service Manual, Page 182Get this manual
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; then secure with the snap ring
9Install the 1st driven washer (right side) on the shaft making sure it lines up with the groove in the shaft; then turn the washer locking it on the shaftCC219D