Well, no... That's where things get fun with the D44 fronts. Certain years (Uh, 86-89?) had a vacuum disconnect!
'82 thru early '86 with NP229 tcase and some NP228s. The NP208 and NP219 rigs were 1 piece (lockouts on NP208. NP219 was full time and hubs would destroy it if ran unlocked)
A: They are strong enough to handle AMC 401s, but I slide them engaged and put the shift fork behind to keep them that way and go with manual hubs. (I had one rig with vac axle and hubs. I could lock the hubs before bad spots, then flip the dash switch to engage the axle w/o getting out again)
There is a BOM number that can be used to find out what they are from. If you found a driver's drop D30 with manual hubs and 5 on 4.5 pattern, it most likely came from a early Bronco II. I think they did 3 years of solid axle? (going from damaged memory)