I TG06 311 RPO DEFINITIONS JD7 BRAKE SYSTEM HYDRAULIC POWER DISC DRUM LB4 ENG NE 4 3L 4 3Z V6 LO3 ENGINE 5 0L 5 0E V8 T B I L05 ENGINE 5 7L 5 7K V8 DIGITAL FUEL INJECTION NA I EMISSION SYSTEM LESS THAN 8500 LB GVW NA4 EMISSION SYSTEM ABOVE 8500 LB GVW UJ I INDICATOR SYSTEM BRAKE WARNING 1993 GENERAL MOTORS SERVICE PARTS OPERAT 0NS LIGHT TRUCK 53G 2 93 an 6 000 GROUP