I agree with BigSilly on the tire tread choice alone; yet you seem to be more worried about having your diff. locked or not. Here's a shot of the Rzr before many significant mods could be fabricated for it earlier this year:
(From the highlifter.com forum):
Highlifter Forums
The Rzr is not necessarily a 'mud machine', IMO...yet I'm not all that fond of sitting around to wait for somebody in my group to get stuck in some mudhole, to begin with. It's like full-size wheeling to me: some guys like to go 5 mph all day in a 1/2 mile long caravan eating each other's exhaust and stopping for hours on end at each obstacle....and some like to see as much scenery as possible with only 'bad luck' (vs "watch how stuck I can get") breakdowns along the way.
If you have your heart set on mudding side-by-sides...I'd spend money on a lift kit and big tires...while
saving money for what you obviously realize will be an expensive date as the relationship with your machine progresses.(also, and don't take this the wrong way...but if a 2wd Prairie is is
dead stopped in a mud hole and the diff.lock 'like majic' walks it out?...you weren't
that stuck in the first place or may not have been with Polaris' 4WD system engaged to begin with).
