GMPartsGiant.com offers the wholesale prices for genuine 1990 Chevrolet Suburban R2500 parts. Parts like E.C.M. Module & Wiring Harness 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 6.2L Diesel, 8 Cyl 7.4L. Model Code: 3/4 TON.