GMPartsGiant.com offers the wholesale prices for genuine 2019 GMC Sierra 1500 Limited 4WD parts. Parts like Transfer Case & Components 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 5.3L. Model Code: 1500 DOUBLE CAB STANDARD BOX.