The most is dogbones.Also had problems with pinions,shock shafts..As I said I'm not trying to bash this car down.Just dissapointed at its quality.My 1st car when I started into GP cars was the serpent quattro.I think it was the time when Rody Roem won his world title in Japan.Before that our local scene was dominated by if I'm not mistaken a car called SG Columbia.I had a lot success by the quattro.So I don't thinkl I asking a lot by expecting better quality out of the S710.