[nutz4sand]

Some systems WILL over drive the driven clutch (driven faster rpms than the motor/drive clutch) but usually NOT while loaded! (i.e. driving unless geared way too deep.)

What you need to be looking at (IMO) is the gear ratio the sled had from the DRIVENS shaft to the drive bogeys that spun the track. And you need to know the diameter of those drive bogeys.

Those drive wheels are just like the "tire size" the stock sled saw. Those are in effect its "wheels" and what the sled was geared for. The track just increases surface area for flotation/traction.

For easy numbers sake if the track drive wheel was 10 inches in diameter and your tires were gonna be 30 inches you would need a 3 to 1 ratio AFTER the bottom shaft.

If you are not using the sleds gearcase reduction you need to figure/add that in as well. Some use the sleds gearcase cause most sleds (that are not RER) can be gotten with reverse. Which is never bad to have.

Plus you will need deeper gearing yet to deal with the extra weight of a buggy usually.

With a CVT a tad deeper is better than a tad shallow on the gearing.