GMPartsGiant.com offers the wholesale prices for genuine 1998 GMC Suburban K2500 parts. Parts like Transmission Auxiliary Oil Cooler are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L. Model Code: 3/4 TON.