It's everything. All that's original is the case. The rear end was built by Mustangs Unlimited ( I believe that was the name ) out in Ca. I paid $995 to get it built, then I had shipping on top of that. The bearings, gears, tru-Trac, it's all new. The man that built it promised it by a certain date and didn't send it on time. I had to have Moser (50 miles away ) build me the same thing overnight to make a meet in Cincinatti. That's why I have it. It arrived two weeks after I needed it. I can ship it in the Moser plastic box the other one came in. Send me your e-mail and I think I've still got pictures of it on my computer. Jim