the axle is tough as shit. approx. 8.75" ring, 3rd member design, etc. locker options are ARB, stock LSD, or you can sign up for a special production lockright at 4x4wire. Gear ratios are 4.10 (kinda rare) 4.30, 4.56 (most common) 4.77, and 5.38 (tera). the one you're looking at should be about 57.5-58" wide.
contact Joe Darlington here in NC or Matt Brown at Independent4x.com in VA. They are both great vendors.