1978 Ski-Doo Shop Manual, Page 23Get this manual
SECTION 01 SUB-SECTION 04 (DRIVE AXLE)
INSTALLATION
If the drive axle to be installed is new component and the vehicle is equipped with speedometer, speedometer drive insert must be installed into the axle endEnsure that insert is flush with end of axlePosition drive axle assembly into locationInstall shim between bearing and lower chaincase sprocketInstall end bearing housingInstall chaincase and position oil seals, making sure that gap of approximately mm (116") exists between end of bearing housing and each oil sealII