How many quarts?

Okay I did a search and I think this Link will help you.
http://www.forabodiesonly.com/mopar/showthread.php?t=195392
Please post back your findings when you get the Cover off. Some Pictures would Be great. If it's a Clutch type 7 1/4, then you have a nice rare rear. Not as tough as 8.25/8.75 but still better than a plain old 7 1/4.
If you jack up the rear end and spin one wheel the other side will probably spin the opposite direction. This indicates that it's not a Sure Grip. If it spins the same direction, It's a Sure Grip.