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    *UPDATE* GM Files Patent for 7-Speed Dual Clutch Gearbox

    September 26th, 2013

    Drew Dowdell

    Managing Editor - CheersandGears.com

    Patent Drawings published on September 19th reveal that General Motors has filed a patent for a 7-Speed Dual Clutch Transmission. While there has been talk about a conventional GM 8-Speed automatic for a while, a 7-Speed DCT could give GM an upmarket transmission to offer in premium products from Cadillac or the Chevrolet Corvette.

    At the moment, the 2014 Corvette Stingray will be shipping with a 6-speed auto when the buyer opts not to row his own, leading us to believe that this 7-Speed DCT could be offered in the Corvette in the future. We also speculate that with a couple of V-series Cadillacs on the way, the timing could be right for an introduction in one of them.

    Update: A reader points out that the output shaft in the above drawing is offset to the side of the transmission (label 16). This means it is highly unlikely that this is a rear wheel drive transmission, but instead is a front wheel drive, transversely mounted transmission.

    Source: CorvetteBlogger.Com, US Patent Office

    Drew Dowdell is Managing Editor of CheersandGears.com and can be reached at Drew.Dowdell@CheerandGears.com or on Twitter as @Cheersngears

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    The 9-speeds that Jeep is using are a ZF design but built by Chrysler.

    My complaint with DCTs is their performance in traffic situations. I hope GM can address that with this transmission.

    The Ford one (Powershift or whatever it's called) used in Volvos is quite smooth even in traffic. Sampled it once in Sweden with a 1.6L diesel V60 wagon and with that engine I actually liked it better than the standard manual gearbox.

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