![]() ![]() ![]() ZF says the eight-speed setup is 6 percent more fuel efficient than ZF's old 6HP six-speed automatic and can add another 11 percent gain in efficiency when combined with an optional start/stop feature that automatically shuts the engine off when the vehicle stops and restarts it when the brake is released. Using an eight-speed transmission has two big advantages: improved fuel economy and shorter gear steps between cogs, for quicker acceleration and smoother shifts. It can manage up to 516 pounds-feet of torque. It's not a dual-clutch transmission but ZF says shifts can be performed in only 200 milliseconds. ![]() The transmission uses four planetary gearsets and five shifting elements (multi-disc clutches and brakes). The 8HP gearbox is already used in BMW's 760Li and the 5 Series GT and the new Rolls-Royce Ghost. Chrysler and German driveline and chassis component supplier ZF have reached an agreement that will see ZF supply and license manufacturing rights to its 8HP eight-speed automatic transmission for use in Chrysler vehicles, including potential application in Ram full-size pickups. ![]()
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