Just buy the super clod. As MickeyD mentioned, install ball bearings from the start. Add a hi-torque servo and a good esc. also 4 - 4" shocks won't hurt. Run it stock first and see if you want your clod to run faster, or try crawling later. Lots of option parts (most especially chassis) for the Clod. I have mine slightly modded with stock chassis. I like it stock, very monster truck-ish .