GMPartsGiant.com offers the wholesale prices for genuine 1994 GMC G2500 parts. Parts like Relays 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, 3/4 TON PASSENGER.