GMPartsGiant.com offers the wholesale prices for genuine 1998 Chevrolet Express 2500 parts. Parts like Wiring Harness/Accessory 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 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel. Model Code: 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS.