TP00 018 RPO DEFINITIONS I MT1 TRANSMISSION AUTO 4 SPD THM R2 4L80 MT8 TRANSMISS ON MANUAL 5 SPD NEW PROCESS J M20 TRANSMISS ON MANUAL 4 SPEED MUNCIE NA5 EMISSION SYSTEM FEDERAL REQUIREMENTS NA6 EMISS ON SYSTEM ALTITUDE REQUIREMENTS I NB2 EMISSION SYSTEM CAL FORNIA REQUIREMENTS E T I 1 1992 GENERAL MOTORS SERVICE PARTS 0PERAT ONS LT TRUCK 53P I 0 000 GROUP 0 40 I 9 9E