GM PRODUCTION OPTIONS RPO EY LY DIVISIONAL RPO DESCRIPTION SPOGM RPO DESCRIPTION G66 76 88 ABSORBER AIR BOOSTER RR SHOCK W MAN LVL CONT G66 G67 76 77 ABSORBER AUTO LEVEL CONTROL SHOCK SYSTEM W A L C G67 G67 78 89 ABSORBER ELEC LEVEL CONTROL SHOCK SYSTEM W ELEC LVL CONT G67 G72 8O 80 AXLE RR 2 14 RATIO W 2 l4R G72 C72 81 81 AXLE RR 2 14 RATIO EXPORT W 2 14R G72 EXPORT G72 82 87 AXLE RR 2 14 RATIO W 2 14R G72 875 82 87 AXLE RR 3 62 RATIO W 3 62R G75 G8C 76 89 AXLE RR LOCKING TYPE LIMITED SLIP W G8O G83 82 83 GEAR RING 8 75 W 8 75 DIA RNGR G83 G87 76 88 GEAR RING 8 50 W 8 50 DIA RNGR G87 G88 76 83 GEAR RING 8 875 W 8 875 DIA RNGR G88 G89 76 87 GEAR RING 7 50 W 7 50 DIA RNGR G89 692 76 88 AXLE PEREORMANCE RATIO W G92 695 85 88 AXLE ECONOMY RATIO W G95 HA3 82 89 AXLE RR 5 29 RATIO W 5 29R HA3 PC2 76 81 AXLE RR 2 76 RATIO W 2 76R HC2 RC4 76 89 AXLE RR 4 56 RATIO W 4 56R HC4 RCT 76 89 AXLE RR 5 13 RATIO W 5 13R HC7 RC8 76 87 AXLE RR 3 21 RATIO W 3 21R HC8 RDI 82 84 AXLE RR 5 83 RATIO W 5 83R HD1 HE3 76 84 AXLE RR 3 07 RATIO W 3 07R HE3 RE4 76 81 AXLE RR 3 4O RATIO W 3 4OR HE4 RE7 76 89 AXLE HEAVY DUTY RR 4 56 RATIO W H D 4 56R HE7 RE8 76 89 AXLE RR 4 88 RATIO W 4 88R HE8 PKI 82 86 AXLE RR 2 87 RATIO W 2 87R HK1 RK9 82 84 AXLE RR 5 86 RATIO W 5 86R HK9 ROA 76 88 AXLE RR 4 11 RATIO W 4 11R HO4 B22 T6 81 AXLE RR 6 17 RATIO W 6 17R H22 R23 76 81 AXLE RR 5 43 RATIO W 5 43R H23 RAD 85 85 EMISSIONS CONTROL 6 CYL SPRING OPERATED EEE W EMIS CONT H4D R4D 85 85 Z8 CYL CAST IRON EXH MANIE W EMIS CONT H4D R5D 85 85 EMISSIONS CONTROL 6 CYL VACUUM OPERATED EEE W EMIS CONT H5D RSD 85 85 18 CYL STAINLESS STEEL EXH W EMIS CONT H5D JA 76 88 BRAKE SYSTEM POWER LIGHT DUTY W JA1 JA2 76 88 BRAKE SYSTEM POWER HEAVY DUTY W JA2 JA3 76 83 BRAKE SYSTEM POWER STATION WAGONS W JA3 JA3 84 86 BRAKE SYSTEM POWER EXTRA HEAVY DUTY W JA3 JA4 76 81 BRAKE SYSTEM DISC DRUM W JA4 JA5 76 85 BRAKE SYSTEM POWER HEAVY DUTY W JA5 JA6 76 81 BRAKE SYSTEM MANUAL EXTRA LIGHT WEIGHT W JA6 JA7 86 89 HANDLE LEATHER PARK BRAKE RELEASE W LEA BRK HDL JA7 JA8 82 88 BRAKE SYSTEM POWER MEDIUM DUTY W JA8 781 76 89 BRAKE SYSTEM MANUAL DISC DRUM W JB1 382 76 81 BRAKE SYSTEM DISC DRUM W JB2 583 76 89 BRAKE SYSTEM VACUUM POWER DISC DRUM W JB3 JR5 76 89 BRAKE SYSTEM VACUUM POWER DISC DRUM W JB5 J86 76 89 BRAKE SYSTEM VACUUM POWER DISC DRUM W JB6 387 76 89 BRAKE SYSTEM VACUUM POWER DISC DRUM W JB7 JB8 76 89 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM W JB8 JC4 82 87 BRAKE ERT VENTED ROTOR W JC4 JD3 76 87 BRAKE SYSTEM VACUUM POWER DISC DRUM W JD3 JD5 76 89 BRAKE SYSTEM POWER DISC W JD5 JD6 76 89 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM W JD6 JD7 76 89 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM W JD7 UE1 76 89 BRAKE SYSTEM EUROPE EXPORT W JE1 EXPORT UE9 76 89 BRAKE SYSTEM HYDRAULIC POWER 4 WHEEL DISC W JE9 JG1 88 88 SHAET PROP ALUMINUM W JG1 311 76 83 PADS CUSTOM PEDAL TRIM W CUST PADS JL1 TL2 76 83 BRAKE SYSTEM ERT POWER DISC W JL2 JL5 82 83 BRAKE ERT SOLID DISC W JL5 JL6 76 89 BRAKE SYSTEM MANUAL DISC DRUM CAST IRON W JL6 JL9 87 89 BRAKE SYSTEM POWER ERT 8 RR DISC ANTILOCK W JL9 TM3 88 89 BRAKE BOOSTER DOUBLE DIAPHRAM HI ELOW 24OMM W BOOS JM3 IM4 86 89 BRAKE SYSTEM POWER ANTILOCK CAST IRON W JM4 JM5 82 89 BRAKE BOOSTER DOUBLE DIAPHRAGM ZOOMM W BOOS JM5 JM7 76 89 BRAKE BOOSTER SINGLE DIAPHRAGM W BOOS JM7 JM8 76 87 BRAKE SYSTEM POWER ANTILOCK ALUMINUM W JM8 341 82 89 BRAKE SYSTEM POWER DISC DRUM CAST IRON W J41 J42 82 88 BRAKE SYSTEM POWER DISC DRUM ALUMINUM W J42 JSC 76 89 BRAKE SYSTEM VACUUM POWER W J5O 355 76 89 BRAKE SYSTEM HEAVV DUTY POWER VAR 1 W J55 I I 6 1988 GENERAL MOTORS SERVICE PARTS OPERATIONS CHEVROLET 17E RPO 12 REV 6 88