I was thinking about doing a disc brake conversion on my XJ's rear 8.25.  Supposedly you can use all the hardware from a ZJ and do the conversion pretty easily.  I found a guy on Craigslist parting a zj but he doesn't want to separate the brakes from the axle.  If I bought the whole axle, got the brakes off, is the axle worth anything for scrap?  It's a D35 with 3.73s.