Hi i think it should be no vac pump and 100 amp standard (assuming its the same as my 2000 4.2) ive found that they are quite a good alternator built well i only just repaired mine after 325000kays and all i did is bearings and brushes all the patrol hitachi alternators ive seen all of them bar one was brushes and the other did the diodes they shoulld be able to replace the brushes and bearings.