2010 Polaris Sportsman 850 Service Manual, Page 255Get this manual
FINAL DRIVE 11Remove the left rear suspension and drive shaft from the vehicle as an assembly13Remove the (4) through-bolts retaining the rear gearcase to the frame
X2 Gearcase Shown Here
14Move the gearcase forward in the frame and remove the vent line from the gearcase
12Remove the through-bolt fastener retaining the right rear upper A-arm to the bearing carrierPivot the wheel hub and bearing carrier down to remove the drive shaft from the gearcase