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Pretty substantial squeak from the rear end suspension. I had my wife drive it down the path and I could hear it more than the engine. Also loud when trailing. Is there a lube point back there the dealer might have missed? Seems to be from either the sway bar or the suspension. Not when idle, just when suspension depressed. Trying to find a way to post audio as it's really loud.

Did you find the source of the squeaking?  Our 2015 450i has the exact squeak in the rear end and I cannot pinpoint it.  The front end also has the squeak as well.  I think it's something with the steering line, maybe tie rod end.  I've greased the rear end and have sprayed penetrating oil in every joint but no success.  I've been considering replacing the tie rod end but haven't found the part online. 

Very delayed update: I was finally able to get around to researching and I found the Arctic Cat Prowler drain plug part # 3306-027.  It ended up being the same part as my '15 Kymco 450i.  Thanks to everyone for their suggestions and to Randy for the Arctic Cat suggestion.  We were able to take it out on the trails again today after 2+ months out of action. 
 

Forgot about the tire question. Article I read many years ago discussing all terrain tires stated offroad miles wore tires out way faster than pavement. The reason being was that sand/dirt is very rough. Can't remember all the details but a grain of sand/dirt has many different sharp edges. My UXV 700i has maybe 3/4 of the tread left with just over 1k miles. Mine mostly runs in grass, yard, road right away (grass), 15% dirt and maybe 10-15% pavement. If it continues, I might get 2.5k or more out of my factory tires.

I actually had changed the sparkplug some time ago and it didn't do a thing for the stalling.  Do you have one you'd recommend?  It's easy enough to try another.  I'm also wondering if anyone has tried Seafoam?  I watched a video on it and they spray it just past the intake before the throttle body but say not to do it where there is an oxygen sensor downwind.  It looks like there are a few plugs there that I wouldn't want to mess up.  Is there a way to spray past them? 

I actually bought the Sunf tires too...still waiting to put them on.  My originals with 900 miles are pretty worn.  They're used mostly on dirt and rock here in AZ.  The machine is really capable...have had it basically rock-crawling at times, teetering on two wheels.  We've had it on top of a 14,000 foot peak in Colorado.   We actually had to rescue a guy in a newer Yamaha side by side the other week who broke down.  He rode in the bed back to the main road area with us. 

I just changed the front diff oil to the full synthetic 75-140 like recommended.  It didn't seem like enough drained out probably due to the leak I mentioned before.  Also, on the drain plug there were tiny metal pieces.  After it was done draining, I sprayed it out with brake cleaner and refilled the oil.  Took it for a test drive and shifted to 4wd.  The shift sounds louder than it had before.  Any idea why?  I know the metal in the oil probably wasn't a good thing.  I've only got 200 miles on it but it was my first diff oil change.

My front differential looks like it's leaked because there's wet dirt stuck around the front/bottom seam.  I'm confused about how high the level should be inside.  On the top of the differential above the fill plug there's a stamp that says "oil level."   On the bottom of the differential below the fill plug there's also a stamp that says "oil level."  Also, if I was to top it off if needed, I know SAE 80 is recommended.  I've got a bottle of limited slip oil.  Is that ok with the locker?

Thanks everyone. 

Would a different width tire on the rear cause any problems with the differential?

Hello, we're taking a trip to Moab and since we'll be more remote, a spare tire is probably a good idea.  However, i know the front and rear tires are different widths.  Because of price, if I only get one spare, which should i get?  Can a narrow front tire fit on the rear in emergency?  Or can a fat rear tire fit on the front in emergency?