What can a 7 1/4 rear take???

Lots if good info everyone! From the specs to the real world experience I can begin to understand more about the 7.25 rears and their breaking points.

How can I tell what kind of 7.25 I have? I can identify the 7.25 rear by looking at the bolt pattern on the back, but can I figure out what kind of gears I have without opening it up?