2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 161Get this manual
FINAL DRIVE 5Install the rollers and roll cage into the ring gearInsert the rollers as the roll cage is installed, installing the lower row first and then the upper row8Install the other output hub (B) and thrust bearing (C) into the output case halfApply small amount of grease onto the seal surfaces to aid installationInstall the ring gear over the output hub and into the output coverInsert the backlash pad (G) and set assembly uprightInstall the left output case half onto the right-hand assembly by holding it as shownVerify the backlash plate thrust bearing and armature plate stay in place during assembly7Install the armature plate (D) onto the ring gearVerify the plate tabs are places into the slots on the roller cageNOTE: Verify backlash plate stays in place