Prepping an 8 3/4 Rear End...

So as I'm sitting at home most weekends going mad as all I do is surf the forums during the day instead of studying, I figured I might as well start working on the diff to prepare it for it's future installation in the Dart. It's an A-body 8 3/4 rear end with 10" drums and sbp. It has an open 489 case with 2.76 gears in it. I believe it came out of a 1970 Dart with a towing package out of a pick-a-part. All the brake lines seem to be intact. Anyways, the rear end is pretty greasy and I haven't touched it since I bought it almost a year ago. It's going to be swapped in when I start working on the suspension for the Dart and swapping the leafs. I just got a set of some shock plates I found on FABO and I believe the leaf springs I want to order come with the required U-bolts.

My question is, what are some simple things I can do to get this differential ready for it's swap. What's the best way to clean it? How do I change the lubricant? Should I tear it apart? Is this a fairly easy task? I think I'm going to keep the 2.76's for now as I don't mind the highway cruising. Thanks for all your help!