According to a senior engineering resource, Mercedes Benz is reportedly working on 9 Speed Automatic transmission that will leap frog the ZF 8-speed units being used by Audi and BMW.
Christened the 9G-Tronic, the better spread nine ratios are said to deliver huge improvements in fuel economy and lowered CO2 emissions. The source also mentioned that development of gearbox with more than 9 ratios is unlikely. Mercedes engineers think that nine ratios is the maximum that is technically possible as well as being the most that end consumers will be able to cope with.
Source: autocar.co.uk
The new gearbox will be used on large displacement engines and will most likely debut on the 2012 Mercedes S Class that is currently under development and will further trickle down to higher end E-Class models as well.

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