Turn the brake drum around and put it on "bell" out,, put on a coupla wheel nuts about 6 turns,, then use the drum as a slide hammer,, and tug the axle out by pushing and pulling the drum..
Depending which diff you have,, it may or may not have a "collapsable/crush spacer" which may need replacing.. If you got a parts list from the diff bill,, that may show a "spacer/sleeve"..
To be sure we need the last 3 digits off the left front snout of you diff.. 741, 742, 489, eg..