Found this
Car & Driver article interesting:
It's an interesting modular approach to making one transmission case that can be customized with multiple options, including input from (A) a "regular" torque converter, (B) an electric motor (for hybrid applications) or (C) a multiple clutch pack for increased efficiency & shifting speed (better acceleration).
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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. However, the eight-speed is roughly 20 percent cheaper and retains the smooth, torque-converter starts to which U.S. buyers have become accustomed.
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And interesting for those who like to practise engine-off coasting with automatic transmissions...
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Furthermore, the 8HP has a system to maintain hydraulic pressure even when the engine isn’t running and is therefore the first automatic that’s compatible with stop-start operation—good for 11 percent better fuel efficiency, says ZF.
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More info at:
ZF?s 8-Speed Automatic Transmission - Tech Dept. - Auto Reviews - Car and Driver