The gearbox is pretty bulletproof, I regularly bash with my Ultima using a 13 turn brushed motor in it, and the same gears in my basher Optima as well and both get plenty of abuse.
Your main problem with a high power motor is keeping the front end down and getting any steering on throttle. The ball diff can't be used as a slipper, there are no replaceable diff washers in it so if it slipped you would need new hard to find diff parts very quickly. You could try the OT-74 Limiter Gear Set from the Turbo Optima, but that is designed to absorb shock loads on the transmission, for example on landing from jumps, than something that is designed to limit the torque through the transmission.
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