Pinion covers were updated in 2018 to steel. The older aluminum ones are known issues and its one of the first mods that is recommended to avoid costly repairs. A new billet aluminum one only cost $120, too bad you didn't know about that before you blew yours. Hopefully you didn't cause any damage to the front diff and only need to buy a new pinion cover.i have the same problem on my 2017 polaris 850 xp. im so done with buying a polaris , they had a recall in 2016 for the same problem but did not fix the problem in 2017.i owned a suzuki 700 for 10 years and never broke anything.