GMPartsGiant.com offers the wholesale prices for genuine 2003 Chevrolet Suburban 1500 4WD parts. Parts like Accelerator Control are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 5.3L, 8 Cyl 5.3L Flex. Model Code: 1/2 TON.