Yeah, as others said, gear down, servo, servo mount.
When I was servo shopping, the local racers I talked to all said look for +300oz/in torque for truggy. Racing truggies are running lighter wheels with less power than us bashers, so that is why I went with +400oz/in. Also, when servo shopping make sure you are reading the 6.0v specs, and not 7.2 or 8.4. Also watch the speed, some cheaper high torque servos are really slow. My Kraton runs a Savox 2270sg and my Talion had a Protec 150t.