I used the rcmonster revo mount but I didn't modify the chassis. I modified the rcmonster mount. I cut the side off where it gets small and then redrilled the holes in the mount as far to the opposite side of where they were origiinally. Then I just mounted it on top of the original motor mount that came in the jato so I can adjust gear mesh with the screws in the bottom or the ones that go into the motor. I may end up having to buy a better motor mount that is not cast like the traxxas one is and I also might have to take a little material away from the front of the transmission housing depending on what pinion and spur I end up using for clearance.