This XKR-S is still, after all, a 2-ton two-plus-two coupe with a big engine up front and a six-speed automatic transmission.

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Driving the rear wheels via a sophisticated seven-speed automatic transmission, the two power sources make the S400 feel every bit as lively as the conventional S550 version with its 382-horsepower V8 engine.

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The two rivals are developing a high-volume, six-speed automatic transmission suitable for front-wheel-drive cars.

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It had a four-speed transmission and fully working transfer case, so you could switch from two- to four-wheel drive.

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The two biggest U.S. auto makers have agreed to jointly develop a nine-speed and a 10-speed automatic transmission for use in their portfolios of cars, crossovers, sport-utility vehicles and pickup trucks.

WSJ: GM, Ford Team Up to Develop New Transmissions