2011 Arctic Cat 366SE ATV Service Manual, Page 91Get this manual
3Using plastic mallet, tap lightly to remove the differential coverAccount for an O-ring and shimNOTE: If the cover is difficult to remove, pry on the cover in more than one recessed location
5Unstake the lock collar; then using the 48 mm Internal Hex Socket, remove the lock collar securing the pinion gear assembly
CAUTION
Failure to completely remove the staked material from the lock collar will result in the destruction of the threads in the gear case housing