GMPartsGiant.com offers the wholesale prices for genuine 2001 Chevrolet Silverado 3500 4WD parts. Parts like Block-Underhood BEC are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 6.0L, 8 Cyl 6.6L Diesel, 8 Cyl 8.1L. Model Code: 3500 CREW CAB, 3500 EXTENDED CAB, 3500 REGULAR CAB.