This is a drop in part ( meaning nothing else required) that replaces the 46% overdrive gear inside a Vanquish VFD Twin, providing a permanent 6% overdrive to the "front" shaft. This allows for Front and Rear Dig/Burn inside a VFD Twin. This can be used with the trans either the FORWARD OR REAR mounted. This is also ideal for REAR Engine Buggys with VFD-Twins mounted backwards where the front drive shaft shaft is now driving the rear axle in conjunction with my motor mount.