manual hubs

Have a set of warn hubs, 30 spline of my early 1980 fj40 with disc brakes. One of the engagement sleeves inside is pretty beat up but the hub engages fine. When I pulled these off to do a knuckle job, there were no random bits floating around so it must’ve been like this since the last time...

1995 Prado and 4WD isn’t working. I’ve got vacuum and t-case is engaging so I’ve narrowed it down to the hubs. I think my plan is to convert to manual hubs but we are currently having a snow storm and would like to use my truck. Am I correct in assuming I can pop the front hub covers off and...