^^^^:edit: , damn, you beat me to it.
If you have an LSD or an Open diff and not a locker, then it is simple enough. If you are using the Jap disc rear end it is even easier, although I have personally never replaced an axle on one.
Remove caliper + disc
Remove 4 bolts holding axle assembly in.
Find a REALLY big hammer or Axle puller.
Start hitting or pulling, whichever.
And it should pop out.
New ones are availible through AJPS if you have the zenki (?) T series with the big axles, otherwise you should be able to source a replacement through a wrecker.
Javal.
