1982 Ski-Doo Shop Manual, Page 244Get this manual
SECTION 03 TRANSMISSION
'From the left side of vehicle, place the drive axle within the trackPush the end bearing side of axle through the orifice in left side of frame, then push the splined end of axle into gearbox lower sprocketInstall opposite drive axlePress each end bearing housing into frame and over axle bearingSecure housings to frameInstall seals
SUB-SECTION 08 (GEARBOX)