So I got a few tanks through it today with the new axles and drive shafts. Ran great. But. There's always a but in these posts. About mid way through the fifth tank I started hearing a gear whine and by the time I got it back over to me the spur gear was destroyed. My question here is. If it made it throughout 4 or 5 tanks of hard, high RPM bashing, did I have it set up wrong or did it maybe suck up a rock or some thing