GMPartsGiant.com offers the wholesale prices for genuine 2001 Chevrolet Silverado 1500 HD 4WD parts. Parts like Automatic Transmission Oil Cooler Pipes are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 6.0L. Model Code: 1500 CREW CAB LONG BOX.