1974 Ski-Doo Shop Manual, Page 60Get this manual
REMOVAL Remove cab, pulley guard, drive belt and muffler from vehicleRemove brake assembly and transmission rod, (shifter)Remove steering lower bracket from Slacken upper bracketRelpClse chain tension Releasptrack tension by unlocking link plate springsIn sert pry bar between structural members of center bogie wheel sets and pry sets upward to reversed installation positionReverse front then rear bogie wheel setsRemove rear axlesRemove oil seals from end bearing housings and center frameRemove end bearing housings(Pry out housings with two (2) screwdrivers inserted between housing and frame) Release drive axle sprocket teeth from track notches while at the same time, pulling the drive axle towards end bearing side of frame(This action will disengage the axle splines from the lower sprocket of the gearbox)Allow drive axles to remain within the tracksRemove gearbox and gasket from frameLayshaft gear free-play: NOTE: If the the dowel tube has been removed from the lay axle, install the tube into Axle using soft faced hammerthe gearbox011 passage