GMPartsGiant.com offers the wholesale prices for genuine 2020 GMC Yukon 4WD parts. Parts like Wiring Harness/Roof are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 5.3L, 8 Cyl 6.2L. Model Code: 1500 4 DOOR SUV.