NO, But, and this is very important, the Drive Chain on a Snow Trac is NOT standard 80 ASE. Most belt and chain specialty places will make this mistake and sell you the wrong stuff. It will chip the teeth of the large sprockets. The correct chain is available from the chain suppliers here in the states. It is manufactured in Japan as well as Germany and England. From the Chain Data a Gear Place can determine the correct 'Pitch Diameter', but they will still need the old gear to determine the internal spline size. For both the small and the large sprockets the overall width needs to be exactly what it was originally manufactured at. I'm not talking about the width of the teeth. On the Variator the End Play of the axels as well as the seal depend on the overall width of the gear. Likewise on the big (36 & 42) tooth drive sprockets there is a seal surface as well as a width dimension that prevents the shaft from sliding back and forth. This should be kept to just a few thousandts. Some Snow Trac's original bearings in the Axel Housing (ST17 on old style Snow Trac, ST53 on new style Snow Trac, ST51 on New Style Snow Master, and I don't know the number for a Trac Master, but it's different that the Snow Master) had tapered roller bearings that needed to be held together and adjusted just like the front wheel bearings on an old truck or car. There is a substitute bearing that is Fixed in a race and does not require the 'End Play' adjustment which I highly recomend. Even with these one should have only a few thousandts of an inch end play or problems will develop with the seals and brakes. Also, only on old style snow trac and trac master, the bolts that hold the brass sprockets to the brakedrum will rub on the support ear of the Axel Housing and eventually grind off the ear. Drive chains should be replaced at roughly 3000 Mile intervals. Carry a spare master Linc.