Use synthetic or regular automatic transmission fluid if you don't want to buy the Cat stuff. Polaris makes the best gear lube.
80/90w gear lube is too thick for a snowmobile. The chain case doesn't create that much heat. Your not actually meshing heavy gears with a high side load like the axle of a car, it is chain to gear. Transmission and transfer cases survive everyday with ATF.
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, trails, riding tips, modifications, classifieds, accessories, troubleshooting, maintenance, and more!