GMPartsGiant.com offers the wholesale prices for genuine 2008 Chevrolet Avalanche 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 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L. Model Code: 1/2 TON.