2008 Arctic Cat ThunderCat ATV Service Manual, Page 74Get this manual
4Install the countershaft gear onto the countershaft and secure with snap ring (flat-side away from the gear)5Using rubber bands to support the connecting rods, carefully install the crankshaft assembly into the crankcase GZ334A
NOTE: It will be necessary to rotate the crankshaft back and forth to engage the teeth of the oil pump and countershaft gears
6Install the driveshaft; then with flat washer on each end of the reverse idler assembly, install into the crankcase
8Place two flat washers on the drive gear end of the countershaft and one flat washer on the high driven gear end; then with shift forks and shift fork shaft, install the countershaft assembly into the crankcase