Matt, unfortunately that was not the stuck axle you were hitting....short answer...yes, you'll need to replace the piece. I know there was someone that did the exact same thing and posted about it a while ago....and in his case, I want to say he went the route of using JB Weld as I think he had only cracked his. Not sure, but I'll look for the thread.
Personally, I'd replace the broken parts and not worry about a repair holding.

Almost forgot....the name of the part that you broke is the output hub assembly.....around $225

 

I have an extra hub out of my
Parts diff I'll sell the hub for 50 ready to drop in you just pay the PayPal fee also. Let me know if ur interested

 

You better buy the hub that Wakethis has offered you. And Wakethis, cool deal on the offer, great guy to jump in and offer parts.

 

I am very interested in the hub.
Are they difffrent on either side or the same?
I hit and broke the passenger side

 

I have a freind that welds aluminum on race cars, I wonder if he could weld a thin plate back over it?

 

Already paid him for it. Yes I agree! Thanks for the part!

 

Be a whole lot better than trying to weld such a thin piece. Goodluck! And hey, we all make goofs from time to time, especially when working on Mechanical stuff. Could write a book on my goofs. LOL