If the axle has adjustable retainers you can pull the retainer flanges and the axles come out with them.

Easy test is to remove the 5 nuts holding the retainer/brake drum backing plate to the housing, if the axle come out you are ok.

If not:

1. Pull the rear cover.
2. Remove the small bolt holding the large pin going through the carrier.
3. Pull out the large pin and push the axles towards the center.
4. Remove the large c clips on the end of the axles
5. If you haven't already removed the 5 nuts per side on the retainer flanges, remove them.
6. Pull the axles.

For the spring perches I grind the old ones off carefully and position the new ones paying close attention to the angle relative to the pinion. I tack them on and take them to a better welder than I am. LOL
I pull the axles and the cover but not the center carrier. Probably not necessary but makes me feel like I did something. Others may have better ideas.