If the larger motors fit with the "dual ratio" boxes then obviously that would be a benefit. I had these in my euro jagdpanther and found better performance using the stock 3shaft boxes with bigger motors - rs395 motors from banebots just BARELY fit. Would not have worked with the dual ratio boxes. The torque is fine now but unfortunately the big problem is that there is almost no rolling resistance on the 3-shaft boxes, so the tank is extremely difficult to turn. "Super spin" is the only way to turn the tank. (Or maybe im just a poor driver). With my ibu2 i can turn the super spin off entirely, with only 1 track powered the tank drives in a straight line. For me, in addition to greater torque, a big benefit of the 4 shaft boxes is the additional resistance from the improved gear ratio, which means the tank can turn easily - much more controllable.

Has anybody ever come up with a workable tank brake? Really need a worm gear drive or something where the tracks cannot roll unless power is applied.