GMPartsGiant.com offers the wholesale prices for genuine 1992 GMC G3500 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 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 7.4L. Model Code: 1 TON CARGO, 1 TON COMMERCIAL/RECREATIONAL VEHICLE, 1 TON PASSENGER.