1972 Ski-Doo Shop Manual, Page 90Get this manual
'-13-12 REMOVAL 1
GEAR BOX
Drain gear box oil (fig1-13-34)
7Remove four (4) bolts securing gear box to frameRemove aligning shim(s}8Using two (2) large screwdrivers inserted between frame and gear box, pry gear box from vehicle (fig1-13-37)