1980 Ski-Doo Shop Manual, Page 283Get this manual
SECTION 05 SUB-SECTION 08, (GEARBOX)
Install gear change shaft on upper housing then on outside of housing, position shimgear change lever washer and nut Torque to 23 N-m (17 ft-Ibs)Using feeler gauge, check that free-play of gear change shaft is within tolerance of 0.15-0.30 mm (.006 to .012")If free-play is not within tolerance, record discrepancyRemove nutwasher, gear change lever, shim,
INSTALLATION
Prior to installation, with the gearbox removed, adjust gearbox to obtain correct engagementAt "forward"
position, sleeve must be as shownFORWARD POSITION
and gear change shaftDivide discrepancy by two and install that amount of shim Install shaft into upper housing
on gear change shaft
Install remaining shims on gear change shaftInstall gear change lever as per following illustrationInstall washer ft-Ibs)
and nut Torque to 23 Nom (17
At "reverse" position, sleeve must be as shown,