Just bought two 4.11 R180s last week. Both supposedly came out of 1986 normally aspirated 200SXs. I ended up looking at 6 R180 diffs and picked out the two best. I also looked at a couple 4.38 R180s out of the front of 1980-81 Nissan 720 4x4 pickups. Both looked great but I already have a new 4.38 R&P.
Call Foriegn Wrecks West on Lincoln Ave in Santa Ana, CA (714 area code).