Help with bl revo

When I give it gas it doesn't have torq. And when i give it gas it goes but when I hold It the tires don't move but the Cvds do. It doesn't sound that bad I first thought it was the pinion not touching the spur gear but that's not it cause the cvds are moving help idk what's wrong

[lincpimp]

Take the wheels off and check the cross pins behind the hexes. If you are missing rhem it will cause issues. You may also have a stripped (rounded off) hex that is spinning inside the wheel.