Those axles are very strong. I wouldn't hesitate to install a new pinion seal and run it as is. It will probably outlast most of that truck.

Keep your eyes peeled for those axles at junkyards and on facebook and craigslist. You can usually buy them for pretty cheap. I have about 6 or 8 of those third members in my stash. If my current ring and pinion ever give up the ghost, I'll just unbolt and pull the axles out 6", unbolt and remove the old third, install and bolt in the "new" one, and push the axles back in and bolt the axles back. It's very easy to swap out gear sets with these axles since they have that removable third member.


Liquidated my projects
Now looking for a decent '47-'55.1 3100, 3600, or 3800