2008 Arctic Cat 366 ATV Service Manual, Page 109Get this manual
NOTE: If gears are being replaced, use the existing shimsThe numbers are scribed onto the gears: the ring gear has the number on the opposite side of the gears, and the pinion gear has the number on the end of the pinion gear shaft by the splinesIf no number is present, it should be considered as being in the categoryNOTE: If the gear case housing is being replaced, proceed to the following Shimming ProcedureShim Selection sub-section BGear Case Sideinstall 1.3-1.4 mm shim and tighten the bolts to 25-31 ft-lbVerify backlash to be within range of 0.28-0.38 mm (0.011-0.015 in and end-play to be within range of 0.10-0.20 mm (0.004-0.008 inIf not within specification range, reselect shim until backlash specification range can be verified4Prior to final assembling, apply molybdenum disulfide grease to all oil seal lips5Prior to final assembling, prelubricate journal on pinion assembly with SAE 80W-90 hypoid gear lubricant prior to pressing assembly into gear case housingAssembling Pinion Gear 1Install the bearing onto the pinion shaftInstall the pinion shaft collar