1982 Ski-Doo Shop Manual, Page 228Get this manual
SECTION 03 TRANSMISSION SUB-SECTION 07 (CHAINCASE)
REMOVAL
suspension injection oil reservoir (if applicable) battery and battery holder (if applicable) chaincase cover and drain the oil
Pry out drive axle oil seal from chaincase, Remove cotter pins, nuts, washers, sprockets and chain, Remove bolts and nuts securing chaincase to frame,