TPOO 306 RPO DEFINITIONS I I I I JB7 BRAKE SYSTEM VACU UM POWER D S C DRUM GAS ENGINE ROTOR 12 5 X1 28 REAR BRAKE I SHOE 13 X2 5 I JB8 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM GAS DIESEL ENG NE ROTOR 12 5 X1 54 REAR BRAKE SHOE 13 X3 5 JD7 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM DIESEL ENG NE ROTOR 12 5 X1 28 REAR BRAKE SHOE I3 X2 5 LB4 ENGINE 4 3L 4 3Z V6 LL4 ENGINE 6 2L 6 2J D ESEL V8 A LO5 ENGINE 5 7L 5 7K V8 D GITAL FUEL INJECTION MT8 TRANSMISS ON MANUAL 5 SPD NEW PROCESS M20 TRANSM SSION MANUAL 4 SPEED MUNC E ul 1992 GENERALMOTORS SERVICE PARTS OPERAT ONS LT TRUCK 53P 0 000 GROUP 0 50 9 92