Boondock, I hate to tell you this, but you really are better off using Pure Polaris oils for all of your gear cases. The rear "diff" uses angle drive fluid. It sure isn't 90wt gear oil! Then tranny and transfer case use the same oils, a very slippery purple concoction of poly-wonderful goodness. And then there is the front demand drive fluid. It is very special, because it is working to not only lubricate and cool, but it's non-conductive properties allow flawless operation of the armature and the Hilliard drive mechanism. There are several suppliers that say their oils are suitable for the RZR. I don't doubt that for a minute, but for the $40 a year I spend on gear lubes, I'm not taking any chances.