Why swap the axle? Fix the one you have. Next axle might also be ready to go. When my Caprice roasted its rear end, I got another one with limited slip, with full intentions of rebuilding it and then swapping it in. Guess what? Axles were badly scored on the driver's side. Already had a pair of new Mosers ready to go in though, so it was fine.
Rebuild your axle and you have a good axle. Go with another axle, and who knows what you get.
Rebuild your axle and you have a good axle. Go with another axle, and who knows what you get.