2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 244Get this manual
FINAL DRIVE 13Install the seals into the case halves using standard seal installer or other suitable methodSeal depth should be approximately .110 in(2.79 mm) from the main surface
Gearcase Assembly
123Grease all seals with Polaris All Season Grease (PN 2871322) upon assembly to prevent from damaging sealsInstall the ring gear into the main gearcaseInstall the shim previously removed onto the ring gear