81989 I C TRUCK SERIES IDENTIFICATION A 2 DOOR 2 DOOR 2 DOOR WHEEL CAB TO PICKUP PICKUP BLAZER PAYLOAD BASE AXLE SERIES FLEETSIDE FLEETSIDE JIMMY LBS MM MM ST10603 O3 W E63 S 2750 983 5 1856 MM BOX 1000 1500 ST10803 03 W E63 1625 1228 2261 MM BOX T 5T10653 EXTENDED 1000 3122 I 983 53 W E63 1500 1856 MM BOX 5550510 16 w 555 5000 2555 10603 AND 10803 ONLY L4 REQUIRED M73 4 5 NOTE All light duty model numbers are preceded by the letter C for Chevrolet models and by the letter I T for GMC Truck and Bus models All GMC Truck and Bus model identifications are obtained through 1 stipulation of RPO Z88 I A FMST 003 1 113088 I 4 E L 2 DOOR PICKUP 2 DOOFI PICKUP M 2 DOOR UTILITY I Y FLEETSIDE EXTENDED CAB BLAZER JIMMY I I FLEETSIDE V 5 1990 GENERAL MOTORS SERVICE PARTS OPERAT ONS LT TRUCK 52S REV 10 90 I I 11