Remove axle nut at center of hub
Remove ball joint nut, crack the side of knuckle at the ball joint to pop joint loose from knuckle, seperate the 2 so you can pull axle stub from hub.
Pop inner joint from drive unit (large screwdriver betwen joint and case works) dont damage the seal when popping axle loose, or when pulling axle out.
Fluid pill likely pour out of opening....
Align splines of new shaft straight into the drive unit (rotate slightly to feel the splines properly aligned), hold joint straight, and use axle shaft and slap the joint into place..
Install outer stub into hub, assemble knuckle to ball joint, tighten all.
Correct the trans oil level with proper fluid if you lost any when axle pulled out.