TX05 049 RPO DEFINITIONS I I C7S GVW RAT1NG 1450O LBS JB7 BRAKE SYSTEM VACUUM POWER D SC DRUM GAS ENGINE ROTOR 12 5 X1 28 REAR BRAKE SHOE 13 X2 5 I JB7 BRAKE SYSTEM VACUUM POWER DISC DRUM JB8 BRAKE SYSTEM HYDRAULIC POWER D SC DRUM GAS DIESEL ENGINE ROTOR 12 5 X1 54 REAR BRAKE SHOE I3 X3 5 JB8 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM JD7 BRAKE SYSTEM HYDRAUL C POWER DISC DRUM DIESEL ENG NE ROTOR 12 5 X1 28 REAR BRAKE SHOE 13 X2 5 I JD7 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM JF9 BRAKE SYSTEM HYDRAULIC POWER 4 WHEEL DISC LL4 ENGlNE 6 2L 6 2J DIESEL V8 LOS ENGINE 5 7L 5 7K V8 DIGITAL FUEL INJECTION Y L19 ENGINE 7 4L 7 4N V8 T B I MT I TRANSM SS ON AUTO 4 SPD THM R2 4L80 MT8 TRANSMISS ON MANUAL 5 SPD NEW PROCESS I M20 TRANSMISS ON MANUAL 4 SPEED MUNCIE BF8 SPRING REAR O 500 LBS t 1992 GENERAL MOTORS SERVICE PARTS OPERATIONS I T TRUCK 53P 5 000 GROUP 542 9 92