yeah I think you will be fine with 37's.   yeah I'm 230:1 but I really havnt even used the lowest gear yet, its way too low for snow bashin.  I didnt completely break my stock hub gear. The groove around the gear that holds the snap ring was cracked and pieces were breaking off of it.  luckily I caught it before it completely broke and caused damage to the splines.  The Longfield hub gears are 65 each