The flywheels used with these gearboxes are dual mass versions (petrol engines) to eliminate the noise that 3-axle (3-shift) gearboxes can make in neutral, and a regular (single mass) flywheels for the diesel engine.
The flywheels integrated into these gearboxes for petrol engines are designed to minimize the noise produced by 3-axle (3-shift) gearboxes in neutral, whereas single-mass flywheels are used with diesel engines.