1985 Ski-Doo snowmobile Service Manual, Page 393Get this manual
Section 05 SUSPENSION Sub-section 02 (SLIDE SUSPENSION)
Installation
Using the appropriate equipment, lift the rear of vehicle off the groundTo perform installation of suspension into frame; it is necessary to determine the proper height:Leave rear portion of suspension on ground, lift rear of vehicle high enough to keep gap between front spring end and bottom of frame when cross shaft is close to its frame holes
25,29, Upper front cross shaftscrew
Insert screwdriver into one side of frame to maintain cross shaft when installing screw into hole of other sideDo not tighten Replace the screwdriver by the right screw
NOTE: The above mentioned gap is important to prevent spring torsion at the time of installing suspension system