The first gear is the largest and heaviest in a transfer box gearing gear set. Its design as a cascaded gear therefore offers the greatest optimization potential for package and weight reduction.
Cascaded gears are being used for the first time in dual clutch transmissions 6DCT150 and 6DCT200. Here the first speed is achieved using a bridge with the gears of the second, fifth and sixth speeds.
This mainly allows extremely compact dual clutch transmissions for subcompacts and therefore efficient automation in this vehicle class.