​The 2-way Crown Gear Drive units offer the relative rotation between the 2 shafts as shown in the catalog.  In some cases, the units with the opposite relative rotation can be built – contact the factory. A 3-way unit may be used in this case by either not connecting to the 3rd shaft or by removing it (at the factory or in the field).
The 3-way Crown Gear Drive units are symmetrical along the axis of shaft #1 as shown in the catalog.By flipping the unit over along the shaft #1 axis, you can change the relative rotation between the input and output shafts using the same mounting locations.