When you put those screws back on. Use anti-seize. Then the next time you take them off. One whack with an impact driver and they are loose. Mine have come off that way for almost 14 years now.

Also, you do want to put them back on. I am sure some have left them off without issues. But, the one widely written about person here on the Zone that left them off had a tire leave his truck while coming home from the 2004 FE on I-40 at speed. I ended up buying those axles from him soon after because he went to 14ff/D60's.