1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 123Get this manual
TRANSMISSION (STLAVVRENCE) 6Place thrust washer into positionNOTE: Tapered side of thrust washer must face toward the inside of the synchronizerBend the locking tab against the side of the captive bolt headPosition the safety plate and spider assembly on the drive plate shaftNOTE: Insure component is fully seated on the shaft