Originally Posted by RB FIVE
You could run a blackfoot in mod truck.
But I wouldn't recommend it...
I'm a Tamiya fan as well, but I've diversified in order to have more fun racing at the track. It's fun to be different, but you really need setup and parts support to have a good time racing. Otherwise, it's just no fun doing donuts in every corner and then breaking to find that there are no parts in the hobby shop to fix your car... This is ESPECIALLY true if you are just starting out, since an experienced racer can drive around a poor handling car, but a new racer really needs all the help they can get in terms of a decent setup. New racers also tend to wreck and break more stuff, so having parts available to get you back up and running is really important. Nothing like paying a track fee to drive for 2 minutes, break, and go home.
In terms of car selection, no one really races "monster trucks", they are all stadium trucks which basically means AE or Losi. Honestly, I'd keep your monster trucks just for fun. The easiest class to get into the hobby is 2WD stock truck, imo. Well that was before the Slash - more on that later.
2WD mod buggy is pretty difficult to drive. 4WD mod buggy is pretty expensive to maintain. Oddly enough, the only competitive Tamiya off-road vehicles are their 4WDs: TRF501X ($$$), and the budget plastic version the DB01 Durga/Baldre. I've seen a few of the DB01 run very competitively at our track, so I've taken to building one up. If you must race a Tamiya, I'd recommend a DB01 with a 19T once you get used to racing.
Slash - pros and beginner alike LOVE this class. $200. Darn near impossible to break. They handle kinda silly (not super hooked up like a competition buggy/truck), and the racing is a BLAST. This class is just plain fun, and it's a great way to get started in racing. On top of that, you will probably never "grow out of it". There are a lot of old pros that run the Slash class because it's a break from the norm and you can't help but smile when you race these things.
Best of luck, and let us know how it turns out!