I TPO4 331 A RPO DEFINITIONS I V A JD7 BRAKE SYSTEM HYDRAULIC POWER D SC DRUM I JF9 BRAKE SYSTEM HYDRAULIC POWER 4 WHEEL DISC I I L19 ENGINE 7 4L 7 4N V8 T B I J 5R4 CHASSIS PACKAGE 1 10 INCH WHEEL BASE LOW PROFILE V I all I J V wi I j 1992 GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 53P 4 000 GROUP I 4 124 9 92