It's like driving a tank, nothing stops u. Like mongrol says no speed, about a 40% reduction. Had a KQ goin 70k. they throw alot of snow at higher speeds.
35-4000 depending on what system u use. Know of a guy who goes through waste deep muskeg in 2wd in his rhino.
I have the Prospector Track System No Gear reduction until you put a Clutch Kit in it. It Also Takes Lots of power to turn them. But they are unstopable. Ive won a few ATV Pulls with them