Let’s start with what’s not new: the interior window switches, the pickup box floor stampings, and some fasteners. Although the gasoline powertrains mostly carry over, the Pentastar V-6 and Hemi V-8 engines both employ fancy new eTorque starter/generators that store deceleration energy in a 0.43-kW-hr battery pack. The energy is then fed back to the powertrain in such a way as to optimize fuel economy—like helping sustain a cruising speed without downshifting or reverting from four- to eight-cylinder mode. More than 40 shift maps allow the eight-speed transmission and the eTorque motors to cooperate to wring every possible mile from a gallon of gas. The V-6’s unit is water-cooled and contributes 12 hp and 90 lb-ft; the V-8’s is air-cooled and delivers 16 hp and 130 lb-ft. These motors start the engine in 0.55 second after an auto stop, and they’re used on initial starts except in cold conditions, when a conventional starter does the job.
Two more novel fuel-economy boosters: A heater/cooler for the rear differential oil in rear-drive trucks enables the use of lighter-weight lower-friction oil, and a pair of active mass dampers on the frame cancel vibration so the Hemi can lug a bit more in cylinder deactivation mode without anyone feeling it. The ultimate fuel-saver, an EcoDiesel V-6, arrives later in 2019 without eTorque mild hybridization (that same engine in the new Wrangler produces a Ford F-150 Power Stroke diesel-besting 260 hp and 442 lb-ft).
Let’s talk chassis: The entirely new, 98 percent high-strength-steel ladder frame features a taller, narrower boxed cross-section that improves bending strength. Octagonal-section front frame-rail extensions are mandrel-bent and welded into that shape from tailor-rolled sheet steel that varies from 3 to 2 mm thick going forward to ensure they crumple. These octo-rails splay outward to capture small-offset crash forces. Despite a 4-inch wheelbase stretch (to a claimed longest in class), the new frame dropped 100 pounds for a 17 percent weight savings. Max payload increases by 420 pounds to 2,300, and towing capacity increases from 10,650 to 12,700 pounds. (That beats Chevy, Nissan, and Toyota but falls short of Ford’s 3,270 and 13,200 ratings.)
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