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Nine-speed transmission details unveiled

by David Zatz on

zf nine speed automatic transmission for Chrysler and Dodge cars and minivansZF released the world’s first nine-speed automatic transmission for passenger cars in June 2011, months after Sergio Marchionne said Chrysler and Dodge would use them. ZF claimed fuel savings of up to 16% with these transmissions, compared with “today’s standard six-speed automatic transmissions in front-transverse installations.” They are stop-start, hybrid, and all-wheel-drive capable.

These transmissions have a surprisingly wide total spread of 9.84, allowing for both low first gears and high overdrives, boosting launch performance without highway-mileage penalties (keeping top gear down to 1,900 rpm at 120 km/hour versus 2,600); having nine speeds allows for normal gear steps between those extremes, allowing engines to run in their optimal speed ranges.

Full details are on our ZF nine-speed automatics page.

Thanks, redhed, for catching this

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