GMPartsGiant.com offers the wholesale prices for genuine 2006 Chevrolet Avalanche 1500 4WD parts. Parts like Sheet Metal/Underbody 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.