I have an exceed 1/10 scale short course truck. Currently having an issue. The engine is running properly, and I have checked everything I know. When I accelerate the engine revs but the car doesn't move. I recently changed the center dif and it ran great for about 5 tanks of gas over a 2 day period and then.......same thing engine revs but the car does not move. Again I have check everything I know so if anyone has any input or suggestions they would be greatly aapreaciated.

Youve checked the wheel pins,an all drive cups grub screws if any?Not familure with that one.
Sometimes the diff cups have set screws that loosen up..

Have you checked the clutch. What have you checked so we can narrow this down a bit