2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 160Get this manual
FINAL DRIVE 16Inspect the output shaft bushing (arrow)Replace as neededClean the inside surfaces of both gearcase halves
Gearcase Reassembly
123Replace all O-rings, seals, and worn components as previously mentionedPress the pinion shaft seal into the pinion cover, until the seal is flush with the sealing surfaceInstall pinion shaft into the bearing cover, using small amount of grease on the seal, bearing and input cover with new o-ringTorque screws to specification