Rear end experts, I need your advise! Are these axles junk?

[ford38v8]

Chris, you're concerned about the wrong end of the axles. Those gears are fine, they need only to engage the spider gear, and turn only slowly as you go round a corner. What you need to examine closely is the other end, namely the axle nut threads, and especially the keyway. The axle nut threads can be way far gone and still be serviceable, but the keyway must be pristine with no indication of a crack at the inboard end. The smallest crack there will have your wheel go off one otherwise fine day.