How do you remove front sprocket on 1996 polaris magnum 6x6 at What holds the inner axle in?

YOu need to remove both CV joints. after that the shaft on which the front sprocket rides will come out of the front diff. Just hit it back with a rubber mallet and put your new sprocket in place then hit from the other side to run the shaft through the sprocket. Reassemble. The front 'axle' or diff is held in by the chassis metal being bent around it. it is not removable.