You are buying 2 used Clark transfer cases for what I was told are for the Michigan Loaders Model 55 / 75.  The models of the Clarks are T75-A3 and T76-B3.  I looked inside and there was a little surface rust on some of the gears, but the gear teeth looked good to very good for what I could see.  Sold "as  is, for parts or rebuilding".  Shipping  is 1600 pounds truck freight at buyer's expense.  I can get you freight quotes.  Ohio buyers have to pay 6.5% sales tax.