SC1 (manual transmission 3 Dr), SW2 (automatic transmission 2000-2001) SW2 (automatic transmission 1992-1999), SL2 (automatic transmission) SW2 (manual transmission), SL2 (manual transmission) SC2 (automatic transmission), SW1 (automatic transmission LHD), SL1 (automatic transmission) SC2 (manual transmission), SW1 (manual transmission), SL1 (manual transmission) SC1 (automatic transmission), SL (manual transmission) Position five encodes the specific model and trim level of the vehicle.ġ995-99 Buick Riviera & Oldsmobile Aurora Though today's GM platforms use Greek characters, they are still encoded with Latin characters in the fourth position. These letters were used as the fourth position of the VIN. GM used a lettered system of automobile platform codes for three decades. Other content includes an engine code and manufacturing plant. GM has traditionally encoded the platform as the fourth character of the VIN.
