[U47]

Just some information for you A/T guys. Dual coupling also has a split torque feature, but the trans that is more intriguing is Roto. Everyone knows Roto is a three speed. The service manual's description is a four range three speed automatic. The service manual counts torque multiplication in 1st gear at 3.50 to 1 and as the multiplier spools up and driving and driven units equal in speed oil begins to pass directly through it causing it to be a simple coupling and a ratio of 2.93 to 1 and as the factory calls it 2nd range. In third range or second gear the fluid coupling dumps which means the transmission is in full mechanical drive and 1.56 to one. In fourth range or third gear the coupling is now full and the ratio is 1 to 1. The HydraMatic book alternately talks in terms of range and gear ratio, so you have to pay attention to which language they are using as one paragraph it's range and the next it's gear ratio. Roto HydraMatic is considered a dual range Hydramatic with drive rt. (DR' ) and drive left ( 'DR ) Just like Super HydraMatic. and uses the same shift quadrant.
Also stated in the HydraMatic manual is this transmission has split torque and that in fourth range or third gear 40% of the engine torque is going through the fluid coupling and the rest is mechanical connection.
Roto HydraMatic is the only automatic that has a real flywheel instead of a flex plate. Roto is the only automatic that has a fluid coupling and a stator.