MAto all metal tanks gear boxes are hit and miss on quality. The gears on all mine wobbled side to side off axis while spinning I tried shimming and breaking back in etc etc. Reallly don't like them. They are also geared low. I think it was 69:1 ratio. But they do keep crawling well on that last hit in IR battle. The chasis are prone to stripping out the gear box mount screws if you take them in and out a few times. The wheels are cast metal rolling directly on a cast metal axel. Terrible design. They gaul up and seized . They are very difficult to get apart to service the frozen up wheel. Keep them well lubed. I had high hopes for the mato but wont buy them any more. I am left with one Sherman built on a mato metal chassis and eventually when the wheels all freeze up again I will can it and move the build over to a taigen.
Sorry, I think they make high priced junk for their drive trains.