GM PRODUCTION OPT IONS RPO FY LY USE DIV MODEL DIVISIONAL RPO DESCRIPTION G75 82 87 AXLE REAR 3 62 RATIO GBO 76 92 AXLE REAR POSITRACTION LIMITED SLIP G83 82 83 GEAR RING 8 75 INCH G87 76 91 GEAR RING 8 50 INCH G88 76 83 GEAR RING 8 875 INCH G89 76 87 GEAR RING 7 50 INCH G92 76 91 AXLE REAR PERFORMANCE RATIO G95 85 88 AXLE ECONOMY RATIO HA3 82 89 AXLE REAR 5 29 RATIO HC4 76 92 AXLE REAR 4 56 RATIO HC7 76 92 AXLE REAR 5 13 RATIO HCP 76 87 AXLE REAR 3 21 RATIO HD1 82 84 AXLE REAR 5 83 RATIO HE3 76 84 AXLE REAR 3 07 RATIO HF7 76 91 AXLE HEAVY DUTY REAR 4 56 RATIO HF8 76 91 AXLE REAR 4 88 RATIO HK1 82 86 AXLE REAR 2 87 RATIO HK9 82 84 AXLE REAR 5 86 RATIO HPR 87 91 HEADLAMPS DUAL RECTANGULAR HO4 76 88 AXLE REAR 4 11 RATIO H4 85 85 EMISSIONS CONTROL 6 CYLINDER SPRING OPERATED EFE 8 CYLINDER CAST IRON EXHAUST MANIFOLD H5E 85 85 EMISSIONS CONTROL 6 CYLINDER VACUUM OPERATED EFE 8 CYLINDER STAINLESS STEEL EXHAUST JA1 76 87 BRAKE SYSTEM POWER LIGHT DUTY JA1 88 89 BRAKE SYSTEM LIGHT WEIGHT DISC DRUM JA2 76 87 BRAKE SYSTEM POWER HEAVY DUTY JA2 88 91 BRAKE SYSTEM HEAVY WEIGHT DISC DRUM JA3 76 83 BRAKE SYSTEM POWER STATION WAGONS JA3 84 86 BRAKE SY5TEM POWER EXTRA HEAVY DUTY JA5 76 85 BRAKE SYSTEM POWER HEAVY DUTY JA7 86 90 HANDLE PARK BRAKE RELEASE LEATHER WRAPPED JA7 88 88 2 N HANDLE PARK BRAKE RELEASE LEATHER WRAPPED USED WITH SE Y92 JA8 82 87 BRAKE SYSTEM POWER MEDIUM DUTY JA8 88 91 BRAKE SYSTEM MEDIUM WEIGHT DISC DRUM JB1 76 89 BRAKE SYSTEM MANUAL DISC DRUM JB3 76 92 BRAKE SYSTEM VACUUM POWER DISC DRUM JB5 76 92 BRAKE SYSTEM VACUUM POWER DISC DRUM JB6 76 92 BRAKE SYSTEM VACUUM POWER DISC DRUM JB7 76 92 BRAKE SYSTEM VACUUM POWER DISC DRUM JB8 76 92 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM JC4 82 87 BRAKE FRONT VENTED ROTOR JD3 76 87 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM JD5 76 92 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM JD6 76 92 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM JD7 76 92 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM JE1 76 93 BRAKE SYSTEM EUROPE EXPORT JF9 76 92 BRAKE SYSTEM HYDRAULIC POWER 4 WHEEL DISC JG1 88 90 SHAFT PROPELLER ALUMINUM JL1 76 83 PADS CUSTOM PEDAL TRIM JL2 76 83 BRAKE SYSTEM FRONT POWER DISC JL5 B2 83 BRAKE FRONT SOLID DISC JL6 76 89 BRAKE SYSTEM MANUAL DISC DRUM CAST IRON JL9 87 93 BRAKE SYSTEM POWER FRONT AND REAR DISC ANTILOCK JM3 88 89 BRAKE BOOSTER DOUBLE DIAPHRAM HI FLOW 24OMM JM4 86 87 BRAKE SYSTEM POWER ANTILOCK CAST IRON JM4 88 91 BRAKE SYSTEM POWER FRONT DISC REAR DRUM ANTI LOCK CAST IRON JM5 82 89 BRAKE BOOSTER DOUBLE DIAPHRAGM 2OOMM JM7 76 89 BRAKE BOOSTER SINGLE DIAPRRAGM JM8 76 87 BRAKE SYSTEM POWER ANTILOCK ALUMINUM J1F 89 91 BRAKE SPECIAL EXPORT J41 82 87 BRAKE SYSTEM POWER DISC DRUM CAST IRON J41 88 92 BRAKE SYSTEM POWER FRONT DISC REAR DRUM CAST IRON J42 82 87 BRAKE SYSTEM POWER DI5C DRUM ALUMINUM J42 88 91 BRAKE SYSTEM DRUM ALUMINUM J50 76 92 BRAKE SYSTEM VACUUM POWER J55 76 92 BRAKE SYSTEM HEAVY DUTY POWER J65 76 91 BRAKE SYSTEM POWER FRONT AND REAR DISC KA5 82 84 VACUUM SYSTEM CAM DRIVEN KA6 82 84 VACUUM SYSTEM BELT DRIVEN KB1 82 84 EXHAUST MANIFOLD SHEET METAL B2 86 87 HEADS ENGINE CYLINDER CAST IRON 1 989 GENERAL MOTORS SERVICE PARTS OPERATIONS BUICK 44J t REV 10 89 RPO 19