Vehicle OverviewTechnical InfoFeatures KBB.com Brand Image Awards. This GMC Yukon XL delivers a Gas V8 5.3L/325 engine powering this Automatic transmission. ENGINE, 5.3L ECOTEC3 V8, WITH ACTIVE FUEL MANAGEMENT, DIRECT INJECTION AND VARIABLE VALVE TIMING includes aluminum block construction (355 hp [265 kW] @ 5600 rpm, 383 lb-ft of torque [518 N-m] @ 4100 rpm)...