I TP04 301 1 RPO DEFINITIONS A C7P GVW RATING 16000 LBS C7S GVW RAT NG 145OO LBS JF9 BRAKE SYSTEM HYDRAUL C POWER 4 WHEEL DISC V MT1 TRANSMISSIONAUTO 4 SPD TI IM R2 4L80 MTB TRANSM SSION MANUAL 5 SPD NEW PROCESS Y10 10 50 DIAMETER RING GEAR SAGINAW REAR AXLE Y12 12 00 DIAMETER RING GEAR ROCKWELL REAR AXLE Y13 11 50 DIAMETER RING GEAR DANA REAR AXLE I YT T 1992 GENERAL MOTORS SERVICE PARTS OPERAT ONS LT TRUCK 53PI 4 000 GROUP I A 4 116 I 9 92