Julius,I am assuming you are with Serpent.I bought the 710 and it has the wrong front one way gear.What is in my kit appears to be a diff gear with 3 pins on back side and round hole in middle instead of hex.Hobby shop says call Serpent USA,Serpent USA is closed for 2 weeks and probably won,t have parts anyway.Can you be of any assitance on this.Don,t mean to put you on the spot just trying to get help.Thanks