GM PRODUCTION OPTIONS RPO FY LY USE DIV MODEL DIVISIONAL RPO DESCRIPTION GT5 76 92 AXLE REAR 4 1O RATIO GTB 76 89 AXLE HEAVY DUTY REAR 4 10 RATIO GU1 76 88 AXLE REAR 2 41 RATIO GU2 76 92 AXLE REAR 2 73 RATIO GU3 82 85 AXLE REAR 2 93 RATIO GU4 76 92 AXLE REAR 3 08 RATIO GU5 76 91 AXLE REAR 3 23 RATIO GU6 76 92 AXLE REAR 3 42 RATIO GV4 82 87 AXLE REAR 3 36 RATIO GV8 82 85 AXLE REAR 2 72 RATIO GW4 84 85 AXLE REAR 3 31 RATIO GW6 85 89 AXLE REAR 3 27 RATIO GW9 76 92 AXLE REAR 2 93 RATIO GX3 88 92 TRANSAXLE FINAL DRIVE 3 33 RATIO GX4 76 83 AXLE REAR 3 75 RATIO GX5 76 83 AXLE REAR 4 09 RATIO GY5 76 87 AXLE FRONT 3 65 RATIO G44 85 91 AXLE REAR 3 07 RATIO G5O 76 91 SPRING HEAVY DUTY REAR G51 76 87 SPRING SPECIAL HEAVY DUTY REAR G51 88 89 6 D SPRING SPECIAL HEAVY DUTY REAR G52 82 91 SPRING EXTRA CAPACITY RR 15000 LB G60 76 91 SPRING REAR AUXILIARY G66 76 87 ABSORBER AIR BOOSTER REAR SHOCK G66 88 89 2 B LEVEL CONTROL MANUAL AIR G66 88 90 1 B LEVEL CONTROL MANUAL AIR G66 88 91 1 A LEVEL CONTROL MANUAL AIR G67 76 B7 ABSORBER AUT0 LEVEL CONTROL SHOCK SYSTEM I G67 88 88 6 D LEVEL CONTROL AUTO AIR G67 88 90 234 H LEVEL CONTROL AUTO AIR G67 88 91 2 A LEVEL CONTROL AUTO AIR G67 88 91 34 B LEVEL CONTROL AUTO AIR G72 82 87 AXLE REAR 2 14 RATIO G75 82 87 AXLE REAR 3 62 RATIO qi G80 76 92 AXLE REAR POSITRACTION LIMITED SLIP GB0 88 90 12 F AXLE REAR POSITRACTION LIMITED SLIP G83 82 83 GEAR RING 8 75 INCH G87 76 88 GEAR RING 8 50 INCH G87 88 91 1 Y 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 MERCHANDISING OPTION 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 HC8 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 H04 76 88 AXLE REAR 4 11 RATIO H4D 85 85 EMISSIONS CONTROL 6 CYLINDER SPRING OPERATED EFE 8 CYLINDER CAST IRON EXHAUST MANIFOLD H5D 85 85 EMISS ONS CONTROL 6 CYLINDER VACUUM OPERATED EFE 8 CYLINDER STAINLESS STEEL EXHAU T JA1 76 87 BRAKE SYSTEM POWER LIGHT DUTY JA1 88 89 1 A BRAKE SYSTEM LIGHT WEIGHT DISC DRUM JA1 88 90 234 A BRAKE SYSTEM LIGHT WEIGHT DISC DRUM JA2 76 87 BRAKE SYSTEM POWER HEAVY DUTY JA2 88 90 1234 A BRAKE SYSTEM HEAVY WEIGHT DISC DRUM JA3 76 83 BRAKE SYSTEM POWER STATION WAGONS JA3 B4 86 BRAKE SYSTEM POWER EXTRA HEAVY DUTY JA5 76 85 BRAKE SYSTEM POWER HEAVY DUTY JA7 86 88 HANDLE PARK BRAKE RELEASE LEATHER WRAPPED JA7 88 88 2 N HANDLE PARK BRAKE RELEASE LEATHER WRAPPED USED WITH SE Y92 JA7 88 89 3 N HANDLE PARK BRAKE RELEASE LEATHER WRAPPED JA8 82 87 BRAKE SYSTEM POWER MEDIUM DUTY JA8 88 90 1234 A BRAKE SYSTEM MEDIUM WEIGHT DISC DRUM 3 1 1989 GENERAL MOTORS SERVICE PARTS OPERATIONS CILDSMOBILE 32J I REV 4 89 npc 19 IA I 4 4