GMPartsGiant.com offers the wholesale prices for genuine 2014 Chevrolet Express 1500 2WD parts. Parts like Relays & Modules-Underhood 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 5.3L. Model Code: 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS.