So my motor came lose yesterday and i chewed up gear for the slipper, went to the hobby shop and pick up a new one put it all back togeather. When i hold the car in the air its got full of power but when i set it back on the ground barely moves and makes a high pitch noise and almost like a grinding noise. Maybe i put the slipper back togeather wrong? Or is there another area i should look at. I tried to tighten the slipper all the way and still no go. Any help would be appericated thanks.