While the 68RFE also comes as the default transmission in the 3500 with the 6.7L Cummins, the Aisin AS69RC automatic six-speed, which was introduced in 2013, is also offered as an optional ...

According to Motor Trend, what it does mean, though, is that the Corvette will rely on an eight-speed auto sourced from Aisin until GM's in-house transmission is ready.