Thanks everyone for the help. I wanted to send an update. I found a machine shop that looked at the locking diff and determined that the parts were made from hardened steel. They quoted me over $1000 for machining and hardening new spider gear axles. I went to another shop, and found someone who machined new pieces from a strong steel, but did not harden it. I was able to get the parts for a more reasonable price, but time will tell if the parts are strong enough.
I think the reason that the part broke originally was a result of the bolts loosening, so I think I should be fine.
For those interested, here is a picture of all the parts of the locking diff. It includes the two original spider gear axles (one broken, the other bent) as well as the new machines parts.
![Original Image](https://packardinfo.com/xoops/html/uploads/newbb/225379phpC8O9eh_sm.jpg)
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