[modler]

If you used the tracks of the model (vinyl), it couldn't work, these trackes are too soft and the torque is too high.
To use the motors and the angle gear boxes supplied with the kit, you need moveable tracks (articulated metal tracks from Friul for instance). Do you have some? If yes, I can send you a couple of shafts.

Oh, that explains it. the soft tracks put too much torque on the output shafts. I get some of those tracks you speak of and try again and yes I need more output shafts.