I heard there might be a rebuild kit out there for the original hubs, or maybe some 4WD shops could rebuild them?
Perhaps other Luv owners can help you if you go this route.
I ended up buying Warn hubs for my 80 Luv 4x4. I bought them way back in 1999. So I'm not sure if you can still get them.
I bought them off a small auto chain called Winchester Auto (Bay Area, CA). The part number (not sure if store or manufacturer number): F30 400422
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1980 Luv 4x4 with a 5 speed tranny.
"When all else fails, follow the directions".