Am trying to find carrier assemly w/4.77 gears from '89-91 Troopers. Most Troops in salvage yards show up on their computers as only having 4.56 ratio. Where does one find the code 6NZ that indicates wide tire package w/4.77's? Would this be in the VIN or stamped on the info plate?

'99 Trooper, ARBs, 4.77s, ARB bullbar, Warn M8000 w/Amsteel, OME 912s w/2.5" spacers, Rancho 9000xs, K&N/Magnaflow, 33" Kumho MT's, Aisins, boulder bars, Indy 4X brake lines, diff drop, Flexalite