GMPartsGiant.com offers the wholesale prices for genuine 2003 Cadillac Escalade EXT AWD parts. Parts like Steering Pump Assembly 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 6.0L. Model Code: EXT 1/2 TON, EXT 3/4 TON.