However, the eight-speed is roughly 20 percent cheaper and retains the smooth, torque-converter starts to which U.S. ![]() ZF says the 8HP is six percent more efficient than the outgoing sixer and nearly as efficient as a dual-clutch automated manual, which ZF also produces. The 6HP will be out of production by 2014. This is an important consideration, as the six-speed is widely employed in the luxury-sport ranks. ZF designed the 8HP to replace the 6HP-of which over 5 million have been produced-and, in doing so, made the new transmission identical not only in dimension but also in weight (200 pounds). Expect to see a hybrid using the 8HP by the end of 2011.Ī third coupling device is available for the most-performance-driven applications: a wet multiplate clutch pack developed by ZF, which is currently found in the Mercedes-Benz E63 and SL63. To save weight, the electric motor can also double as the starter. It can be set up for rear- or all-wheel drive and facilitates hybridization by providing the option of swapping the conventional torque converter for a 47-hp electric motor, increasing fuel economy by a claimed 25 percent when compared with ZF’s old six-speed (6HP). It is designed for longitudinal, or “north-south,” applications. ZF uses the term “kit” because 8HP is not a single transmission but rather one transmission case with various internal, customer-selectable options. ![]() Toyota’s eight-speed gearbox also has four planetary gearsets, but it uses seven shifting elements to create eight ratios-the ZF is a simpler design. ![]() These gearsets are engaged and disengaged by five shifting elements. FCA Adopts ZF's New Hybrid-Ready Transmissionįour planetary gearsets combine for eight gears in all.Fourth-Gen Version of the ZF 8HP Is Coming to FCA in 2022
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