1991 92 TRUCK SERIES IDENTIFICATION 2 DOOR EXTENDED CAB 2 DOOR 4 DOOR WHEEL CAB T0 PICKUP PICKUP UTILITY UTILITY PAYLOAD BASE AXLE SERIES FLEETSIDE FLEETSIDE LBS MM MM ST10603 03 W E63 S 2750 983 1856 MM BOX 1000 1500 STl0803 03 W E63 1625 2995 1228 2261 MM BOX T ST10653 EXTENDED 1000 3122 983 53 W E63 1500 1856 MM BOX 5 515 16 W 555 1505 2555 5 5 5 55w 555 ww 2715 10603 AND 510803 ONLY NOTE A11 light duty model numbers are preceded by the letter C for Chevrolet models by the letter T for GMC Truck and Bus models and H for O ds models All GMC Truck and Bus model identifications are obtained by the stipulation of RPO Z88 Chevrolet by X88 and Olds by Z70 1992 GENERALMOTORSSERWCEPARTSOPERAUONS LTTHUCK 53S 1 92 9