2011 Arctic Cat 400 TRV ATV Service Manual, Page 111Get this manual
AT THIS POINT For servicing the input shaft, pinion gear, needle bearing, ring gear, and axle seal, see Front Differential in this section
RING GEARTHRUST BUTTON Removing 1Remove the cap screws securing the gear case cover to the gear case; then remove the ring gearCF113A
2Remove the thrust button from the gear case cover (left-hand threads)Account for shimInspecting 1Inspect the ring gear for excessive wear, missing or chipped teeth, or discoloration2Inspect the thrust button for excessive wear or discoloration3Inspect the bearings for discoloration, roughness, or excessive wearNOTE: For servicing bearings or seals, see Front Differential in this section
Rear Gear Case
REMOVING 1Remove the left-side rear A-arms (see Rear A-Arms in Section 7)2Remove both of the rear drive axles (see Drive Axles in this section)3Remove the four cap screws securing the engine output shaft to the rear gear case input flange