GMPartsGiant.com offers the wholesale prices for genuine 2003 GMC Yukon XL 1500 2WD parts. Parts like Automatic Transmission Control Valve are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L. Model Code: 1/2 TON.