I had similar problems as previous reviewer, but I had to file off some of the upper deck as well. After flipping the belts, the battery holders need to be modified. I also drilled an extra couple of holes in the chassis so I could move the mounts around a bit. Took some fiddling but it can be done. The rear battery mount needs to be removed to adjust gear mesh which sux a bit. It might be stronger than the stock motor mount, hard to say. I'll crash a few times and find out ;) Its cheap, and it looks nice, so 4 stars.