It is the appearance of aluminum rear bulkhead for GALM. The rigidity around the rear is greatly improved by changing the normal resin to high rigidity duralumin. This makes it possible to significantly improve drift control and traction performance. In addition, the two-piece structure enables access to the differential while the rear bulkhead is mounted on the chassis, and the use of a separate piece hatch for the ball bearing portion that supports the main shaft enables quick center pulley replacement. I was able to do it. As drive system, in addition to normal drive and counter drive, optional gear drive can be selected. Of course, it is also possible to combine floating motor mounting systems (no counter drive is possible).