Problems with Rc car...
 

Hi all!
i have a Rc car that wont work- it wont go forward.
i tought that it could be servos or gearbox problems , but gearbox works good i tryed to connect the gearbox with batery directly and the wheels rotates.
So the problem also could be the broken transmitter or rc cars servos cuz the wheels will turn but it won't move forward, but i do not know how to fix it.
i would be very glad if someone could tell me some tip how to fix it ;) .
And sorry for my bad english :D

is it electric or nitro?

it is electric