Question about the 7 1/4 rear end.

RAT ROD AL said
I have a 71/4 in a 65 Barracuda , would these work for you ?

I'm not sure. I'm dropping the pan here in a few days to redo the RTV, and just wanted to find out what to look for and where to go if I see issues. It seems like the spider gear rebuild is something people do while they have the cover off. Thanks.