1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 161Get this manual
SUSPENSION E) Perform steps B, C, and on the opposite skid frame rail3Replace the rear wheel axle between the skid frame slidesSlide the two (2) rear axle spacers on the rear axleTo obtain the correct positions for the rear axle spacers, the distance from the side of the spacers to the end of the rear axle must be equidistantSpacers must be positioned against the axle slide to obtain an accurate measurementWhen rear axle spacers are properly positioned, secure in place on the axle with the spacer set screwsReplace the two roll pins on the rear axle9end of the rear springs into the spring Slide retainer of the rear armNote the bushings in the spring retainerWith both springs in position, secure assembly in place with flat washers, bolts, and locknutsNOTE: The hooked end of the rear spring must be facing to the inside of the skid frame57