Read over some of the options in the article archive (in screen footer line), under technical; Brentwood, TN and San Diego, CA are 2.
Brentwood speaks of using a Anvil axle housing, XL7 diff housing (3rd member) (mounting mod required), 5.83 gears, mod'd Sami carrier, EZ locker, 26-spline shafts required.
San Diego speaks of using a XL7 axle housing (steel), a GV diff housing (3rd member), 5.83 gears, mod'd Sami carrier, EZ locker. No mention on the shaft requirement, though probably 26-spline.