The Infiniti QX56 is a full-size sport utility vehicle sold under the Nissan-owned Infiniti luxury brand. It is based on the Nissan Armada full-size SUV, and shares the F-Alpha platform with the Nissan Titan pickup truck. The rear door handles are installed on the "C" pillar as a Nissan design tradition started with the 1986 Nissan Pathfinder. When the four door Pathfinder was introduced, Nissan chose to conceal the door handles as a part of the "C" pillar trim to visually make it appear like a two door truck with a camper shell, with conventional door handles on the front doors. The truck... is propelled by a 5.6 L VK56DE V8 engine torque @ 3,600 rpm and a 5-speed automatic transmission with an overdrive. Each cylinder in the engine is lined with cast iron. The valvetrain is a DOHC design with four valves per cylinder. Infiniti designed the QX56's throttle responsiveness to correspond to specific drivetrain modes: when the driver selects all-wheel drive, the throttle becomes less sensitive, presumably to allow easier regulation of acceleration when off-road. The Infiniti QX56 has around 9,000 lb of towing capacity.
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