Mike (RC Monster) could probably make you one, if he doesn't already have one drawn up. That, or you could make one yourself. I've made quite a few of them and it isn't super hard.

As for the gearing, it depends on what motor you go with. If you go with a 1700kv motor, I'd say a pinion in about the 14T to 16T range with a 46T spur gear. As for the motor, that will also depend upon your chosen controller. If you go with a controller that does four pole motors well, then it's easy. Get a Neu. For a truck, the 1515 2.5d is probably as good as it gets. Either that or the 1512 1.5Y or something in that range. If you go with a controller that doesn't like four pole motors, then the Lehner would be the choice, but good luck finding one.

For a truggy on a track, I like the 4S lipo packs. They are a good compromise between power on tap and weight. I run the maxamps 4S2P 8000mAh pack and have had good results with it.