It will have D70 or D80 rear and a D70 front. Front may or may not be closed knuckle. I know of one local W400 that has a kingpin open knuckle D70. I saw an older SRW W400 a few yrs ago with D70's front and it was closed knuckle and I have a D70 closed knuckle sitting at my shop out of one. Most D70 fronts are closed knuckle. The exception are the ones in 94-00 GM 3500HD
4x4's,05+ GM 4500's 4x4's,and some Quigly 4x4 vans. I have a lead on a set from a Quigley if anyone gets excited about owning a set.
T-Case would be a np203 or an np205.