Gear mesh at the motor is off. If the teeth are still good, adjust the mesh so there is just a little play between the motor spur, and the trans gear. Good luck man
Was up homie !!! They got a set of 3d printed small blocks that you can add on the rear of the chassis is one for each comer , is less work n the sparks sticks can be replace !!! I got a video where I have em on the 64 !!!