We used the AM Toughbox kit transmissions on a wide 4-wheel drive, but changed out the stock gears. That changed the ratio on the trannys from about 12:1 to 5:1. Decreasing the torque made spinning out less likely, and made the robot quite a bit faster, although harder to control. It was good to be fast though
We weren't really too interested in pushing, our game was more scoring-oriented.