Oh wait, if I remember correctly, the LST is a monster of a truck. It weighs something over 13lbs, doesn't it? If it does, a Revo at around 10lbs. should walk all over the LST if you were running a 7XL on 4S lipo.

How are you going to setup the motor, etc? Does FD have a kit for the Revo too? If you haven't already, you should check out the RC Monster store.