GM PRODUCTION OPTIONS RPO FY LY DIVISIONAL RPO DESCRIPTION RPO DESCRIPTION 689 76 87 GEAR RING 7 50 IN W 7 50 DIA RNGR G89 G92 76 88 AXLE PEREORMANCE RATIO W G92 G95 85 88 AXLE ECONOMY RATIO W G95 HA3 82 88 AXLE RR 5 29 RATIO W 5 29R HA3 HC2 76 81 AXLE RR 2 76 RATIO W 2 76R HC2 HC4 76 88 AXLE RR 4 56 RATIO W 4 56R HC4 HC7 76 88 AXLE RR 5 13 RATIO W 5 13R HC7 HC8 76 87 AXLE RR 3 21 RATIO W 3 21R HC8 HD1 82 84 AXLE RR 5 83 RATIO W 5 83R HD1 HE3 76 84 AXLE RR 3 07 RATIO W 3 07R HE3 HE4 76 81 AXLE RR 3 40 RATIO W 3 4OR HE4 HE7 76 88 AXLE H D RR 4 56 RATIO W H D 4 56R HF7 HF8 76 88 AXLE RR 4 88 RATIO W 4 88R HF8 HK1 82 B6 AXLE RR 2 87 RATIO W 2 87R HK1 HK9 82 B4 AXLE RR 5 86 RATIO W 5 86R HK9 HO4 76 87 AXLE RR 4 11 RATIO W 4 11R HO4 R22 76 81 AXLE RR 6 17 RATIO W 6 17R H22 H23 76 81 AXLE RR 5 43 RATIO W 5 43R H23 H4D 85 85 EMISSIONS CONTROL 6 CYL SPRING OPERATED EEE W EMIS CONT H4D H4D 85 86 8 CYL CAST IRON EXH MANIF W EMIS CONT H4D H5D 85 86 EMISSIONS CONTROL 6 CYL VACUUM OPERATED EEE W EMIS CONT H5D H5D 85 86 i8 CYL STAINLESS STEEL EXH W EMIS CONT H5D JA1 76 88 BRAKE SYSTEM PWR LT DUTY W JA1 JA2 76 88 BRAKE SYSTEM PWR HVY DUTY W JA2 JA3 76 83 BRAKE SYSTEM PWR WAGONS W JA3 JA3 84 86 BRAKE SYSTEM PWR EXTRA HVY DUTY W JA3 JA4 76 81 BRAKE SYSTEM DISC DRUM W JA4 JA5 76 85 BRAKE SYSTEM PWR HVY DUTY W JA5 JA6 76 81 BRAKE SYSTEM MAN EXTRA LT WT W JA6 JA7 86 87 HANDLE LEATHER PARK BRK RELEASE W LEA BRK HDL JA7 JA8 82 88 BRAKE SYSTEM PWR MED DUTY W JA8 JB1 76 88 BRAKE SYSTEM MAN DISC DRUM W JB1 JB2 76 81 BRAKE SYSTEM DISC DRUM W JB2 JB3 76 88 BRAKE SYSTEM VAC PWR DISC DRUM W JB3 JB5 76 88 BRAKE SYSTEM VAC PWR DISC DRUM W JB5 JB6 76 88 BRAKE SVSTEM VAC PWR DISC DRUM W JB6 JB7 76 88 BRAKE SYSTEM VAC PWR DISC DRUM W JB7 JB8 76 88 BRAKE SYSTEM HYD PWR DISC DRUM W JB8 JC4 B2 87 BRAKE FRT VENTED ROTOR W JC4 JD3 76 87 BRAKE SYSTEM VAC PWR DISC DRUM W JD3 JD5 76 88 BRAKE SYSTEM PWR DISC W JD5 JD6 76 88 BRAKE SYSTEM HYD PWR DISC DRUM W JD6 J07 76 88 BRAKE SYSTEM HYD PWR DISC DRUM W JD7 JE1 76 88 BRAKE SYSTEM EUROPE EXPORT W JE1 EXPORT JE9 76 88 BRAKE SYSTEM HYD PWR 4 WHL DISC W JE9 JL1 76 83 PAOS CUST PED TR W CUST PADS JL1 JL2 76 83 BRAKE SYSTEM ERT PWR DISC W JL2 JL5 82 83 BRAKE ERT SOLID DISC W JL5 JL6 76 88 BRAKE SYSTEM MAN FRT DISC RR DRUM CAST IRON W JL6 JL9 87 88 BRAKE 5YSTEM PWR FRT RR DISC ANTILOCK W JL9 JM4 86 87 BRAKE SYSTEM PWR ANTILOCK CAST IRON W JM4 JM5 82 87 HEAD PWR BRK BOOSTER TANDEM W P B BOOS JM5 JM7 76 B7 HEAD PWR BRK BOOSTER SINGLE W P B BOOS JM7 JM8 76 87 BRAKE SYSTEM PWR ANTILOCK ALUM W JM8 J41 82 87 BRAKE SYSTEM PWR FRT DISC RR DRUM CAST IRON W J41 J42 82 88 BRAKE SYSTEM PWR FRT DISC RR DRUM ALUM W J42 350 76 88 BRAKE SYSTEM VAC PWR W J5O J55 76 88 BRAKE SYSTEM H D PWR VAR 1 W J55 J65 76 88 BRAKE SYSTEM PWR ERT RR DISC W J65 J90 76 81 BRAKE SYSTEM RR DRUM H D W J90 KA5 82 84 VACUUM SYSTEM CAM DRIVEN W KA5 KA6 82 84 VACUUM SYSTEM BELT DRIVEN W KA6 KB1 82 84 EXHAUST MANIFOLD SHEET METAL W KB1 KB2 86 87 HEADS ENG CYL CAST IRON W CAST IRON HD KB2 KB3 82 B4 WATER PUMP ALUMINUM W KB3 KB7 82 83 HEAD CAST IRON W KB7 KB8 82 86 HEAD ALUM W KB8 KC4 76 87 COOLER ENG OIL PASS CAR EXC CORVETTE W KC4 EXPORT KC4 76 88 COOLER ENG OIL TRUCK CORVETTE W KC4 KD1 87 87 COOLER TRANS OIL EXPORT W KD1 EXPORT 1987 GENERAL MOTORS SERVICE PARTS OPERATIONS PONTIAC 21 88