GMPartsGiant.com offers the wholesale prices for genuine 2006 GMC Yukon XL 1500 4WD parts. Parts like Steering Pump Lines 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.