I have a 2010 800 rzr 5k miles on it I bought it about 300 miles ago and since then I have seen the pinion nut problem with them although with 5k on it I don’t think it would back off now but that’s not a chance I am willing to take. This rzr is for my family I put the 3rd seat in and my girlfriend and her daughter and I ride together and right now mostly alone so reliability is huge to me! That brings me to my question should I also split the rear diff and inspect it and replace the bearings and seals. It does turn smooth and had no leaks. What would you guys do? Thnx for any input I am already learning alot from this fourm!!