i believe that you have to space the radio tray so the servos dont hit when the chassis flexes. check losi website there is an addendum (spelling?) to the manual. there is also an o ring kit they have been using. ive also heard people using radio tray stiffners to get a littler more space and create more rigidity in the chassis. check neo buggy forum or truggyracer. ton of info on those forums from people who know a lot more than i do.