2008 Arctic Cat 366 ATV Service Manual, Page 111Get this manual
8Install the proper shim onto the ring gear spider assembly making sure the chamfer side of the shim is facing toward the ring gearInstall the ring gear in the housing; then install the outside shim with the chamfer side of the shim toward the ring gearNOTE: The spider and ring gear assembly must be replaced as complete unit
10Apply liberal amount of grease to the O-ring; then install it on the assembled cover assembly making sure to seat the O-ring down around the circumference of the bearing flange11Making sure the O-ring is properly positioned on the gear case cover assembly, install the cover with existing hardwareAccount for the ID tagTighten the cap screws to 23 ft-lbNOTE: Grease can be applied to the O-ring for ease of assemblingNOTE: If new gear case housing is being installed, tighten the cap screws to 25-31 ft-lb