I've recently been exposed to my first Overland tank drive. I'd wish it were a better product. Of course it didn't work after receiving it off ebay. Right off the bat i knew something was wrong as one of the U-joints had become disconnected. It's no fun ripping brass apart, but this was rather straight forward. It looked like there might be several locations were shorting might be occuring, so I stripped the shell off. The motor seems to be fighting itself most of the time, although on several occasions I managed to get it to turn over. There seems to be binding in the trucks as well. It just seems to be a poorly designed drive unit.