This is a new gear differential unit for use on the XV-02 and TT-02 chassis. When using it on the TT-02 chassis, it allows you to tune the differential action, for the front and rear, with the use of different viscosity oils. When using it on the XV-02, you can use it not only for the front and rear diffs, but also as a center oil-filled diff unit, which will give you even more tuning options!
When using as a centre oil-filled diff unit, on the XV-02 chassis, make sure to use with Item 22050 (06 Module Spur Gear 70T).