Mercedes-Benz Developing Nine-Speed Automatic for Flagship Models
Daimler engineers are preparing a new nine-speed automatic gearbox for Mercedes-Benz’s large-capacity engines, targeting improved efficiency and lower emissions.
Mercedes-Benz is developing a nine-speed automatic transmission for its larger engine models, according to senior Daimler engineering sources. The new gearbox is intended to deliver substantial gains in fuel economy and CO2 emissions, positioning Mercedes alongside rivals who have recently advanced their own multi-speed automatics.
Mercedes-Benz Developing Nine-Speed Automatic Transmission
Focus on Large-Displacement and AMG Models
The nine-speed automatic transmission is aimed at large-capacity engines, including those found in AMG models. These vehicles sit at the top end of Mercedes-Benz’s range, where both performance and efficiency are priorities. With the introduction of this new gearbox, Mercedes hopes to combine strong acceleration and refinement with improved fuel efficiency and lower emissions. This is especially important as emissions regulations become stricter in markets around the world.
According to sources within Daimler, the new transmission will help the company meet tightening emissions standards while maintaining the power delivery and smoothness expected from luxury saloons and high-performance cars. The nine-speed unit is expected to be fitted to Mercedes-Benz’s large-displacement engines, which power models such as the S-Class, E-Class, and AMG variants.
Industry Context: The Push for More Gears
Mercedes-Benz’s move follows a broader industry trend toward transmissions with more gears. Audi, Chrysler, and Toyota have already introduced eight-speed automatics in their premium and performance models. The ZF eight-speed transmission, in particular, has been widely adopted across several brands. These advancements are driven by the need to keep engines operating in their most efficient ranges, reducing fuel consumption and emissions without sacrificing driveability or comfort.
While some manufacturers are now developing ten-speed units, such as Ford and General Motors, which have featured them in models like the Ford Mustang and Chevrolet’s latest automatics, Daimler engineers suggest that nine speeds is likely to be the practical limit for passenger cars. Beyond this point, technical complexity increases and customer patience for frequent shifting may decrease. Engineers believe that nine gears strikes a balance between efficiency gains and the driving experience expected by customers of luxury vehicles.
Technical Perspective and Customer Expectations
From a technical perspective, adding more gears allows for a wider ratio spread. This means the engine can operate at lower revs during motorway cruising, which improves fuel economy and reduces noise. At the same time, shorter lower gears can enhance acceleration. However, increasing the number of gears also adds complexity to the transmission, which can affect reliability, cost, and the smoothness of gear changes. For luxury car buyers, seamless shifting and quiet operation are just as important as efficiency.
Daimler’s engineers have indicated that nine speeds is the practical upper limit for automatic transmissions in passenger cars. They cite not only the technical challenges of packaging and controlling more gears, but also the perception that too many gear changes can become intrusive for drivers. This is particularly relevant in the luxury segment, where comfort and refinement are highly valued.
Implications for Future Mercedes Models
The nine-speed automatic is set to appear first on Mercedes-Benz’s larger and more powerful models, where the benefits of a wider ratio spread are most pronounced. Owners of these vehicles can expect smoother acceleration, quieter cruising at motorway speeds, and improved fuel economy figures compared to current seven- or eight-speed transmissions. The technology is also likely to be incorporated into future AMG performance models, supporting both emissions targets and dynamic driving characteristics.
The development of a nine-speed automatic transmission demonstrates Mercedes-Benz’s commitment to drivetrain innovation in the upper segments of the market. The company is responding to both regulatory pressure and customer demand for efficiency improvements without compromising the luxury or performance that define its vehicles. While no official launch date has been confirmed, this move signals a continued focus on refining the driving experience and meeting future environmental standards.
Comparison: Gearbox Developments Across Manufacturers
| Manufacturer | Number of Gears | Notable Models |
|---|---|---|
| Mercedes-Benz | 9 (in development) | Large-capacity models, AMG (future) |
| Audi | 8 | A6, A8, Q7 |
| Chrysler | 8 | 300, Jeep Grand Cherokee |
| Toyota | 8 | Lexus LS, GS |
| Ford/GM | 10 | Mustang, Chevrolet Camaro |
