To rtk23: look up Plaig RC in Australia. He's been selling upgrades including clutch upgrades and steel parts for a long time. And for $8, get that ball bearing upgrade kit! The Atomic Warhead comes with bushings on the wheels (at least mine did when I bought about two years ago).

Reading around the forum you'll quickly see the trouble spots for these cars. The 2-speed in particular doesn't stand up to abuse, so be smooth on the throttle and you should be ok. I recommend to check all set screws (especially near the transmission and diffs), and check the alignment of the motor - it affects the mesh between the clutch bell and the gearbox. Read up on how to set this mesh (and loctite the engine mount screws).